Hive Server 2 CHAR(N) patch

Adds support for CHAR(N) to hive server 2.

Change-Id: I125e58ccab247e76b1a22b54daceee67a122e852
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4433
Tested-by: jenkins
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>