With diva's permission, temporarily reinsert Unknown UserUMMAU3 to make sure that GUN7 failure has largely disappeared.

Unknown UserUMMAU3 insertion should definitely be removed down the line.
However, I would like a little more time to check the GUN* reduction first, since removing UMMAU3 will make these failures appear as GUN7 instead.
Also bumps GUN6 -> GUN7 and UMMAU2 -> UMMAU3
Merge branch 'master' of ssh://opensimulator.org/var/git/opensim