Updated openstack/openstack
Project: openstack/cinder  1b53a70c807c53fd8a1ebf95bb5533f65989defe

Catch DBDuplicateEntry instead of IntegrityError

'iscsi_target_create_safe' method didn't catch DB exceptions
correct.

Need to catch both db_exc.DBError and db_exc.DBDuplicateEntry
due to current oslo.db limitations: it doesn't handle correct
DBDuplicateEntry with different SQLite versions

Related-Bug: #1187367

Change-Id: Ie412ecabd3cbcac301340c82b4275adb7a7206c3