RANGER-173: Utility scripts to create HDFS audit folders and policies.

RANGER-725: Add the right .gitignore file to the newly added projects so that directory listing is clean after a build.

RANGER-767: Refactor UserGroupSink implementation and consolidate performance improvements.

RANGER-772: Hive plugin Update Ranger authorizer to mimic changes made by Hive standard authorizer for the case when IMPORT can end up creating a table.

RANGER-773: Fix newly found Coverity scan issues for Ranger KMS.

RANGER-778: Fix user update issue.

RANGER-809: Audit framework need to cache the getHostName() values to reuse for successive calls.