SENTRY-549: SentryStore should support more actions for drop/rename (Xiaomeng Huang via Lenni Kuff)
SENTRY-572: Upgrade solr version to 4.10.2 (Reviewed by Prasad Mujumdar)
SENTRY-501: High availability for the SENTRY service(Zookeeper part) (Dapeng Sun via Prasad Mujumdar)
SENTRY-573: Fix NPE caused when rename op is applied on authzObject with no explicit permissions