Remove Manila V1 API client

The Manila V1 API has been deprecated since 2016 and tests
stopped using it in change Id90044bca44387864aee8984bc2366c089c87cfc.
Complete this removal by:

1. Making SharesV2Client inherit directly from RestClient
   instead of the V1 SharesClient
2. Add microversion support added to all methods
3. Removing V1 client registration from plugin.py

Change-Id: I7be74fc22594d3a59932b8bc469f9209cf985fe6
Co-Authored-By: Stephen Finucane <stephenfin@redhat.com>
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
11 files changed