Give DRAIN_JOBS and GET_PRIORITY_ROLLUP seperate command ints.

These two commands were accidentally given the same command int. They
are used by different daemons, which caused the problem to go unnoticed.
We're giving GET_PRIORITY_ROLLUP a new command int. The negotiator will
continue to honor the old int as well, for now.
Merge branch 'V7_9_6-branch'
Comment out a slew of old, unused CEDAR command ints.