ISPN-4643 Make sure EntryIterator doesn't return expired entries
ISPN-4821 RHQ operation 'Upload Proto Schemas' no longer works due to changes introduced by ISPN-4357
Revert "Revert rebalancing per cache"

This reverts commit 8cbba22ae625c7dd3e8f5ff389b71f4b49aec2b4.