Update Docs to clarify that Hive 0.12 w/Kerberos won't work with Knox.

I was experimenting with trying to get Knox working with Pivotal HD 2.1 (based on Apache GA 2.2), which includes Hive 0.12. Knox requires hive.server2.transport.mode=http, which conflicts with enabling Kerberos in Hive 0.12.

Can the docs be clarified to state that Knox won't work with Hive 0.12 when Kerberos is enabled? Larry McCay indicated that unless there's a backport to Hive-server2 0.12 there's nothing that can be done.

Error from Hive-server2:

014-10-24 21:54:29,384 FATAL thrift.ThriftCLIService (ThriftHttpCLIService.java:verifyHttpConfiguration(125)) - hive.server2.authentication setting of KERBEROS is currently not supported with hive.server2.transport.mode setting of http
2014-10-24 21:54:29,385 ERROR thrift.ThriftCLIService (ThriftHttpCLIService.java:run(107)) - Error:
java.lang.RuntimeException: hive.server2.authentication setting of KERBEROS is currently not supported with hive.server2.transport.mode setting of http
at org.apache.hive.service.cli.thrift.ThriftHttpCLIService.verifyHttpConfiguration(ThriftHttpCLIService.java:126)
at org.apache.hive.service.cli.thrift.ThriftHttpCLIService.run(ThriftHttpCLIService.java:48)
at java.lang.Thread.run(Thread.java:745)