Stop waiting for active on 404's, since the server has been deleted (ready for review)

This causes the jobs to last a lot longer, and to be incorrectly logged as nova timing out.

Tested this with mimic just always returning 404.  Creating a group with 1 min entity resulted in otter getting the 404, then erroring and attempting to delete right away instead of continuing to poll.

This results in a log message like:
`Launching server failed: ServerDeleted('Server test-server6664177867-id-6664177867 has been deleted unexpectedly.',)`