Handle volumes no longer existing in resume delete

init_host resumes deletes for volumes with a status of 'deleting'. It
does these sequentially, and sometimes a volume could be deleted under
it, causing a bad stacktrace. This will gracefully handle those
situations and move on. Added coverage for resume volume delete being
successful as well.

Change-Id: I5b30265609b65804f2da77d9daa84b640de7939c
Closes-Bug: #1322340
(cherry picked from commit b8a064f10a4dad097ef40f401015897cf9b424c3)
Merge "Handle volumes no longer existing in resume delete" into stable/havana