Minor cleanups to the commit for IMPALA-1178.

These addressed review feedback from Henry, but I forgot to do a
git add/commit before submitting.  All changes are trivial cleanups.

Change-Id: Ic300a463d4ea6de882dff67ea72033901cac5a25
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4517
Reviewed-by: Daniel Hecht <dhecht@cloudera.com>
Tested-by: jenkins