CHAR(N) Followup Patch

This patch addresses:
  1. Char doesn't use codegen
  2. Not in-lining large CHAR(N) for N > 128
  3. Parquet reader/writer for CHAR(N) and VARCHAR(N)

Change-Id: I83a29a8bd312841a3e29bfe2243884074570f247
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4280
Reviewed-by: Victor Bittorf <victor.bittorf@cloudera.com>
Tested-by: jenkins