Automatic merge from submit-queue

Move the remaining controllers to shared informers

Completes work done in 1.6 to move the last two hold outs to shared informers - tokens controller and scheduler. Adds a few more tools to allow informer reuse (like filtering the informer, or maintaining a mutation cache).

The mutation cache is identical to #45838 and will be removed when that merges

@ncdc @deads2k extracted from openshift/origin#14086