Turn off -e in check-git-commit-message.sh

The script exits with the appropriate code depending on the result
of the test. No need to abort on any particular non-zero status.

Change-Id: Ifcdbb322edc9709c8004f1ceda2973a24b7246f0

jenkins/scripts/check-git-commit-message.sh

@@ -1,4 +1,4 @@
-#!/bin/bash -xe
+#!/bin/bash -x
 
 # Copyright 2015 Rackspace Australia
 #