Reordering tests under the approprite directories

Volume directories tree:
volume/admin/ -> admin tests supported v1 and v2
volume/admin/v2
volume/admin/v3
volume/ -> non admin tests supported v1 and v2
volume/v2
volume/v3

Change-Id: I8e40089e02a7816e26f5dcfda681eb895a9787f3
6 files changed