update grenade old fails to stop bug

we sometimes only catch this on the coming up side, not just the
going down side. Also get rid of all of jog0's fails in the
partial upgrade job.

Change-Id: Ibc88192c1653230eb186228d7cc89b868e8a038a
Related-Bug: #1285323
python-dateutil requires six, be explicit about it

Change-Id: I9ebab96709922708c49b5aa49a929c245f8b5cef