make glance file backend highly available for kolla

Glance 'file' backend is not highly available unless /var/lib/glance is on NFS. It is proposed to mount storage automatically if nfs share is given by a user via ansible variable.

Gnocchi file backend HA for kolla-ansible

Currently the only available backends for Gnocchi are file and Ceph. From these two only Ceph provides high availability. There are ways to make file backend HA without Ceph, e.g. mount shared folder to all Gnocchi servers. This blueprint consists of three parts: 1) allow host mount instead of volume for multinode G...