Introduce the shared file systems storage
service proxy, and add a basic service
resource to list availability zones.
[1] https://tree.taiga.io/project/ashrod98-openstacksdk-manila-support/us/11?kanban-status=2360120
Depends-On: Ia2e62d3a11a08adeb6d488b7c9b365f7ff2be3c8
Change-Id: I20f1f713583c53a2df7fd01af11234960c9c8291
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>