Make NOT right associative to correctly parse things like 'NOT a != b'.

Change-Id: Ic53d8a063a91140fa27e76d6f0eb0db4bce594dc
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5347
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: jenkins
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5462