Cinder: Wait for volume to be 'available' before attaching

VolumesV2ActionsTest creates a volume in resource_setup() but doesn't wait
before attempting a volume attach operation (in the `test_*` methods)

Change-Id: Ic205f1e2ff6902b2e55fe3fccedd6ce1547efb98
Closes-Bug: #1422308
1 file changed