Handle error in test_create_get_delete_service

Better handle create_service raising an exception in
test_create_get_delete_service. If create_service raises an
exception the test now no longer attempts to delete the service.

Fixes bug 1060358

Change-Id: Ie2fb9ee1260bea75397cc6f5ab3e12ad82fd451d
Merge "Handle error in test_create_get_delete_service"