Knox 0.5.0

HDP 2.2.9 provides Knox 0.5.0 and the following additional Apache patches:

KNOX-598: Concurrent JDBC clients via KNOX to Kerberized HiveServer2 causes HTTP 401 error.
KNOX-599: Template with {**} in queries are expanded with =null for query params without a value

HDP 2.2.8 provided Knox 0.5.0 and the following additional Apache patches:

KNOX-459: Apache Knox appears to be leaking sockets.
KNOX-464: Location headers have wrong hostname when used behind load balancer.
KNOX-465: Initial audit record can contain leftover principal name.
KNOX-466: Log exception stack traces at INFO level when they reach gateway servlet.
KNOX-467: Unit tests failing on windows.
KNOX-468: update group lookup topologies to configure cache manager.
KNOX-469: Bring CHANGES and ISSUES up to date.
KNOX-470: add README and site docs for samples.
KNOX-473: Configurable front end URL for simplified load balancer configuration.
KNOX-491: Increase default replay buffer size to 8K.
KNOX-492: Support service level replayBufferLimit for Ozzie, Hive and HBase.
KNOX-504: Enable SSL Mutual Authentication.
KNOX-521: Enhance Principal Mapping to Handle Dynamic Mappings.
KNOX-529: Fix wildcard based principal group mapping.