datastore manager moved to datastore version

Moving the manager from the datastore object to the datastore version
object to allow managers to be changed per version and this change is
reflected in the calls made to trove-manage to update the datastore and
datastore version.

paritally implements bp move-manager-to-datastore-version

Change-Id: I3c720153cbb08a8a3278debc3936854209576241
Merge "datastore manager moved to datastore version"