Fix grains and display

Change-Id: I7bed3b24b63ad7aa274c1adb40c7b3f0ed025462
diff --git a/_states/jenkins_job.py b/_states/jenkins_job.py
index 413908d..6f72d9d 100644
--- a/_states/jenkins_job.py
+++ b/_states/jenkins_job.py
@@ -87,7 +87,7 @@
                     ET.tostringlist(newXML, encoding='utf8', method='xml'), lineterm='')
                 __salt__['jenkins.update_job'](name, config, __env__)
                 ret['changes'][name] = ''.join(diff)
-                ret['comment'] = 'Job {0} updated.'.format(name)
+                ret['comment'].append('Job {0} updated.'.format(name))
 
         else:
             cached_source_path = __salt__['cp.cache_file'](config, __env__)