Default puppet-syntax job to en_US.utf8 locale

As a result of moving to ubuntu-trusty, we need to define a default
LANG.

A future patch should remove this code and migrate to the JJB template
the openstack puppet team use.

Change-Id: Idfe3e7de6ea48752c17accd95661fd803bb1b0a4
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

jenkins/jobs/macros.yaml

@@ -342,6 +342,7 @@
     name: puppet-syntax
     builders:
       - shell: |
+          export LANG=en_US.utf8
           find . -iname *.pp | xargs puppet parser validate --modulepath=`pwd`/modules
           for f in `find . -iname *.erb` ; do
             erb -x -T '-' $f | ruby -c