Clean messages in console in puppet errors

I think warning messages doesn't add much value in console
and sometimes we miss messages with (err).

Change-Id: Ic06ad59f71393dcc2f0f861e45d367fb835a14fc

functions

@@ -209,5 +209,5 @@ function timestamp_puppet_log() {
 }
 
 function catch_puppet_failures() {
-    grep -iE '(warning|error)' ${WORKSPACE}/puppet.log
+    grep -wiE '(Error|\(err\))' ${WORKSPACE}/puppet.log
 }