Revert "Ordering admins user classes by uid."

I'm sorry, but without a clear diff (especially of the other change) noone can properly review this...

Self merging huge changes to admins.pp is also problematic.

This reverts commit b57e06a48bb370da10ff3d6543f3a3acc7b2ee09.

Change-Id: I03fbe5bd334cbfe516cb80e1ef93138d975aea54