SENTRY-555: Ensure groupName returned for dir objects within prefix but not associated with an authz object is not null
SENTRY-545: Disable privilege cleanup by default (Mike Yoder via Lenni Kuff)
SENTRY-556: Remove NPE logging when Sentry Service is not reachable (Reviewed by: Lenni Kuff)
SENTRY-557: Handle Situation when Metastore restarts Listeners thereby resetting the sequenceCounter (Reviewed by : Lenni Kuff)
SENTRY-553: Privilege implies() failed if parent is server privilge and child privilge is URI privilge (Xiaomeng Huang via Lenni Kuff)
SENTRY-555: Make Metastore sync time period configurable (Arun Suresh via Lenni Kuff and Sravya Tirukkovalur)
SENTRY-552: Sentry Store recursive revoke of privilege levels < ALL does not properly downgrade child privileges (Dapeng Sun via Lenni Kuff)
SENTRY-559: Allow prefix paths to be associated with authorizable objects (Reviewed by Lenni Kuff)
SENTRY-560: Sentry HDFS Syncup applies duplicate ACLs for the same scope, group and type (Reviewed by Lenni Kuff)
SENTRY-471: mvn eclipse:eclipse shouldn't default download the javadocs and source jars (shenguoquan via Lenni Kuff)
SENTRY-564: Sentry metastore upgrade order is computed incorrectly (Sravya Tirukkovalur via Lenni Kuff)
sentry-565