Char PARQUET, AVRO, and TEXT tests

Adds fixes and tests for Hive CHAR & VARCHAR compatibility.
Also fixes a bug in tuple materialization for VARCHAR and non in-lined CHAR.

Change-Id: I400b089cb8ddba2e264ef9f2e37956b2ceaaf9fb
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4054
Reviewed-by: Victor Bittorf <victor.bittorf@cloudera.com>
Tested-by: jenkins