Fix wrong arg number for _fix_id_migration issue

If the provider_location doesn't contain the name of the volume, TGT and
ISER will fail on doing a id migration, due to wrong number of
arguments.

Change-Id: I420ceaf14edfb6a0e3b8fd1f50070dc70b6f16bd
Closes-Bug: #1386902
Merge "Fix wrong arg number for _fix_id_migration issue"