VMware: Relocate volume to compliant datastore

During attach to a nova instance, the backing VM corresponding to the
volume is relocated only if the nova instance's ESX host cannot access
the backing's current datastore. The storage profile is ignored and
the volume's virtual disk might end up in a non-compliant datastore.
This patch fixes the problem by checking storage profile compliance of
the current datastore.

Change-Id: I3865654e219c05dcec3aaab07c4cee0658fe181e
Closes-Bug: #1301348
Merge "VMware: Relocate volume to compliant datastore"