Add support for share group quotas for python-manilaclient

Track all activities for adding support of share group quotas to manila client here. Blueprint for server: https://blueprints.launchpad.net/manila/+spec/add-share-groups-quota Spec: https://specs.openstack.org/openstack/manila-specs/specs/pike/add-share-groups-quota.html

Support quotas per share type for python-manilaclient

Share type quotas were proposed [1] for implementation on server side. Its support requires manila client update. Track all activities for it with this blueprint. [1] https://blueprints.launchpad.net/manila/+spec/support-quotas-per-share-type

Create read-write functional tests for python-manilaclient

For the moment we have only read-only functional tests. We need to add tests that cover 'write' operations in addition to 'read' ones.