Ignore stmf target must be offline exception

Patch to ignore

"NexentaJSONException: : Unable to add member to targetgroup:
    stmfadm: STMF target must be offline"

This error happens when targetgroup is already configured and busy.

fixed bug 1209305

Change-Id: I275dcf465934c99d30f85932fe72e8b1818ef870
Merge "Ignore stmf target must be offline exception"