update environment with messages environment

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>

cdist/exec/local.py

@@ -168,6 +168,7 @@ class Local(object):
 
         if message_prefix:
             message = cdist.message.Message(message_prefix, self.messages_path)
+            env.update(message.env)
 
         try:
             if return_output:

cdist/message.py

@@ -56,12 +56,14 @@ class Message(object):
         shutil.copyfile(self.global_messages, self.messages_in)
 
     def _cleanup(self):
+        """remove temporary files"""
         if os.path.exists(self.messages_in):
             os.remove(self.messages_in)
         if os.path.exists(self.messages_out):
             os.remove(self.messages_out)
 
     def _merge_messages(self):
+        """merge newly written lines into global file"""
         with open(self.messages_out) as fd:
             content = fd.readlines()