Set vg_thin_pool to pool name instead of pool_path

create_thin_pool is setting vg_thin_pool to the pool path instead of the
pool_name. This makes volumes creation fail when the create_thin_pool
method is called. This happens because create_volume builds the pool
path itself as create_thin_pool does.

Keeping the pool name in vg_thin_pool instead of the path makes more
sense and allows it to be used in other places in the brick. Also, most
commands return both vg_name and pool_name separated.

Change-Id: Ibf5cd746fc050eab5ce6aff13dd70c1e8066b228
Closes-Bug: #1220286
Add features to Zadara Storage Cinder driver

- move to Zadara APIs 13.07
- added support for extend volume
- added support for create/delete snapshot
- added support for create clones from volumes and snaps
- added support for multi-backend
- added volume stats
- added tests

Implements: blueprint zadara-cinder-driver-update

Change-Id: Iad5908a50980c59df2d8d4702743a0b99f82f9b7
Merge "Set vg_thin_pool to pool name instead of pool_path"
Merge "Add features to Zadara Storage Cinder driver"