Clean up debug logs when building images

When debug mode is set while building the images from source some logs state that it wasn't able to find the source for some services. However, the source for those services are coming from other base service images.
To avoid confusion the logs should be omitted for services that depend on the base image of other services.

Example: tools/build.py --type source

Logs:
DEBUG:__main__:Found /nova/nova-consoleauth
DEBUG:__main__:Found /nova/nova-network
DEBUG:__main__:Found /nova/nova-conductor
DEBUG:__main__:Found /nova/nova-scheduler
DEBUG:__main__:Found /nova/nova-compute
DEBUG:__main__:Found /nova/nova-api
DEBUG:__main__:Found /nova/nova-base
DEBUG:__main__:Found /nova/nova-libvirt
DEBUG:__main__:Found /nova/nova-novncproxy
DEBUG:__main__:Found /gnocchi/gnocchi-api
DEBUG:__main__:Found /gnocchi/gnocchi-base
DEBUG:__main__:Found /gnocchi/gnocchi-statsd
DEBUG:__main__:Found /rabbitmq
DEBUG:__main__:Found /kolla-ansible
DEBUG:__main__:Found /mongodb
DEBUG:__main__:Found /haproxy
DEBUG:__main__:Found /openstack-base
DEBUG:__main__:Found /keystone
DEBUG:__main__:Found /cinder/cinder-backup
DEBUG:__main__:Found /cinder/cinder-volume
DEBUG:__main__:Found /cinder/cinder-api
DEBUG:__main__:Found /cinder/cinder-scheduler
DEBUG:__main__:Found /cinder/cinder-base
DEBUG:__main__:Found /heat/heat-base
DEBUG:__main__:Found /heat/heat-api
DEBUG:__main__:Found /heat/heat-api-cfn
DEBUG:__main__:Found /heat/heat-engine
DEBUG:__main__:Found /mariadb
DEBUG:__main__:Found /openvswitch/openvswitch-base
DEBUG:__main__:Found /openvswitch/openvswitch-db-server
DEBUG:__main__:Found /openvswitch/openvswitch-vswitchd
DEBUG:__main__:Found /logging/rsyslog
DEBUG:__main__:Found /base
DEBUG:__main__:Found /swift/swift-object-server
DEBUG:__main__:Found /swift/swift-account-reaper
DEBUG:__main__:Found /swift/swift-account-auditor
DEBUG:__main__:Found /swift/swift-container-auditor
DEBUG:__main__:Found /swift/swift-object-auditor
DEBUG:__main__:Found /swift/swift-object-replicator
DEBUG:__main__:Found /swift/swift-proxy-server
DEBUG:__main__:Found /swift/swift-object-base
DEBUG:__main__:Found /swift/swift-object-expirer
DEBUG:__main__:Found /swift/swift-base
DEBUG:__main__:Found /swift/swift-container-replicator
DEBUG:__main__:Found /swift/swift-account-server
DEBUG:__main__:Found /swift/swift-object-updater
DEBUG:__main__:Found /swift/swift-account-replicator
DEBUG:__main__:Found /swift/swift-rsyncd
DEBUG:__main__:Found /swift/swift-container-updater
DEBUG:__main__:Found /swift/swift-container-server
DEBUG:__main__:Found /memcached
DEBUG:__main__:Found /neutron/neutron-agents
DEBUG:__main__:Found /neutron/neutron-openvswitch-agent
DEBUG:__main__:Found /neutron/neutron-linuxbridge-agent
DEBUG:__main__:Found /neutron/neutron-server
DEBUG:__main__:Found /neutron/neutron-base
DEBUG:__main__:Found /murano/murano-api
DEBUG:__main__:Found /murano/murano-base
DEBUG:__main__:Found /murano/murano-engine
DEBUG:__main__:Found /data
DEBUG:__main__:Found /designate/designate-api
DEBUG:__main__:Found /designate/designate-base
DEBUG:__main__:Found /designate/designate-backend-bind9
DEBUG:__main__:Found /designate/designate-poolmanager
DEBUG:__main__:Found /designate/designate-central
DEBUG:__main__:Found /designate/designate-mdns
DEBUG:__main__:Found /designate/designate-sink
DEBUG:__main__:Found /zaqar
DEBUG:__main__:Found /keepalived
DEBUG:__main__:Found /horizon
DEBUG:__main__:Found /magnum/magnum-conductor
DEBUG:__main__:Found /magnum/magnum-api
DEBUG:__main__:Found /magnum/magnum-base
DEBUG:__main__:Found /ceilometer/ceilometer-alarm
DEBUG:__main__:Found /ceilometer/ceilometer-collector
DEBUG:__main__:Found /ceilometer/ceilometer-base
DEBUG:__main__:Found /ceilometer/ceilometer-api
DEBUG:__main__:Found /ceilometer/ceilometer-notification
DEBUG:__main__:Found /ceilometer/ceilometer-central
DEBUG:__main__:Found /ceilometer/ceilometer-compute
DEBUG:__main__:Found /ironic/ironic-api
DEBUG:__main__:Found /ironic/ironic-discoverd
DEBUG:__main__:Found /ironic/ironic-conductor
DEBUG:__main__:Found /ironic/ironic-pxe
DEBUG:__main__:Found /ironic/ironic-base
DEBUG:__main__:Found /ceph/ceph-base
DEBUG:__main__:Found /ceph/ceph-osd
DEBUG:__main__:Found /ceph/ceph-mon
DEBUG:__main__:Found /glance/glance-registry
DEBUG:__main__:Found /glance/glance-api
DEBUG:__main__:Found /glance/glance-base
DEBUG:__main__:Found 91 Dockerfiles
DEBUG:__main__:Set atime and mtime to 0 for all content in working dir
DEBUG:__main__:nova-consoleauth:No source location found
DEBUG:__main__:nova-network:No source location found
DEBUG:__main__:nova-conductor:No source location found
DEBUG:__main__:nova-scheduler:No source location found
DEBUG:__main__:nova-compute:No source location found
DEBUG:__main__:nova-api:No source location found
DEBUG:__main__:nova-libvirt:No source location found
DEBUG:__main__:gnocchi-api:No source location found
DEBUG:__main__:gnocchi-statsd:No source location found
DEBUG:__main__:rabbitmq:No source location found
DEBUG:__main__:kolla-ansible:No source location found
DEBUG:__main__:mongodb:No source location found
DEBUG:__main__:haproxy:No source location found
DEBUG:__main__:cinder-backup:No source location found
DEBUG:__main__:cinder-volume:No source location found
DEBUG:__main__:cinder-api:No source location found
DEBUG:__main__:cinder-scheduler:No source location found
DEBUG:__main__:heat-api:No source location found
DEBUG:__main__:heat-api-cfn:No source location found
DEBUG:__main__:heat-engine:No source location found
DEBUG:__main__:mariadb:No source location found
DEBUG:__main__:openvswitch-base:No source location found
DEBUG:__main__:openvswitch-db-server:No source location found
DEBUG:__main__:openvswitch-vswitchd:No source location found
DEBUG:__main__:rsyslog:No source location found
DEBUG:__main__:base:No source location found
DEBUG:__main__:swift-object-server:No source location found
DEBUG:__main__:swift-account-reaper:No source location found
DEBUG:__main__:swift-account-auditor:No source location found
DEBUG:__main__:swift-container-auditor:No source location found
DEBUG:__main__:swift-object-auditor:No source location found
DEBUG:__main__:swift-object-replicator:No source location found
DEBUG:__main__:swift-proxy-server:No source location found
DEBUG:__main__:swift-object-base:No source location found
DEBUG:__main__:swift-object-expirer:No source location found
DEBUG:__main__:swift-container-replicator:No source location found
DEBUG:__main__:swift-account-server:No source location found
DEBUG:__main__:swift-object-updater:No source location found
DEBUG:__main__:swift-account-replicator:No source location found
DEBUG:__main__:swift-rsyncd:No source location found
DEBUG:__main__:swift-container-updater:No source location found
DEBUG:__main__:swift-container-server:No source location found
DEBUG:__main__:memcached:No source location found
DEBUG:__main__:neutron-agents:No source location found
DEBUG:__main__:neutron-openvswitch-agent:No source location found
DEBUG:__main__:neutron-linuxbridge-agent:No source location found
DEBUG:__main__:neutron-server:No source location found
DEBUG:__main__:murano-api:No source location found
DEBUG:__main__:murano-engine:No source location found
DEBUG:__main__:data:No source location found
DEBUG:__main__:designate-api:No source location found
DEBUG:__main__:designate-backend-bind9:No source location found
DEBUG:__main__:designate-poolmanager:No source location found
DEBUG:__main__:designate-central:No source location found
DEBUG:__main__:designate-mdns:No source location found
DEBUG:__main__:designate-sink:No source location found
DEBUG:__main__:keepalived:No source location found
DEBUG:__main__:magnum-conductor:No source location found
DEBUG:__main__:magnum-api:No source location found
DEBUG:__main__:ceilometer-alarm:No source location found
DEBUG:__main__:ceilometer-collector:No source location found
DEBUG:__main__:ceilometer-api:No source location found
DEBUG:__main__:ceilometer-notification:No source location found
DEBUG:__main__:ceilometer-central:No source location found
DEBUG:__main__:ceilometer-compute:No source location found
DEBUG:__main__:ironic-api:No source location found
DEBUG:__main__:ironic-discoverd:No source location found
DEBUG:__main__:ironic-conductor:No source location found
DEBUG:__main__:ironic-pxe:No source location found
DEBUG:__main__:ceph-base:No source location found
DEBUG:__main__:ceph-osd:No source location found
DEBUG:__main__:ceph-mon:No source location found
DEBUG:__main__:glance-registry:No source location found
DEBUG:__main__:glance-api:No source location found