Make the abort more resilient.

If a 'repack -R' operation is cancelled (e.g. ^C), the request was stuck in status
ABORTING. Now it is possible to re-abort such requests, given that aborts
are idempotent and thread-safe.

hsmtools/repack

@@ -348,7 +348,7 @@ def cancelRepack():
         SELECT reqId
           FROM StageRepackRequest
          WHERE StageRepackRequest.RepackVID = :vid
-           AND status IN (6, 0, 1) -- SUBMITTED, STARTING, ONGOING
+           AND status IN (6, 0, 1, 4) -- SUBMITTED, STARTING, ONGOING, ABORTING
         '''
         stAbort = '''
         BEGIN