Pretty-print "msg" when task fails

Several modules (e.g., pip) return stdout and stderr together in a "msg" variable (and the module development docs seem to suggest that the standard practice is to return status in this variable).

This change ensures that it is printed out with correct formatting (most importantly, with newlines appearing as newlines instead of \n).

lib/ansible/callbacks.py

@@ -46,8 +46,8 @@ elif os.path.exists("/usr/local/bin/cowsay"):
 def call_callback_module(method_name, *args, **kwargs):
 
     for callback_plugin in callbacks:
-        methods = [ 
-            getattr(callback_plugin, method_name, None), 
+        methods = [
+            getattr(callback_plugin, method_name, None),
             getattr(callback_plugin, 'on_any', None)
         ]
         for method in methods:
@@ -314,6 +314,7 @@ class PlaybookRunnerCallbacks(DefaultRunnerCallbacks):
             module_msg  = results2.pop('msg', None)
         stderr = results2.pop('stderr', None)
         stdout = results2.pop('stdout', None)
+        returned_msg = results2.pop('msg', None)
 
         if item:
             msg = "failed: [%s] => (item=%s) => %s" % (host, item, utils.jsonify(results2))
@@ -325,6 +326,8 @@ class PlaybookRunnerCallbacks(DefaultRunnerCallbacks):
             print stringc("stderr: %s" % stderr, 'red')
         if stdout:
             print stringc("stdout: %s" % stdout, 'red')
+        if returned_msg:
+            print stringc("msg: %s" % returned_msg, 'red')
         if not parsed and module_msg:
             print stringc("invalid output was: %s" % module_msg, 'red')
         if ignore_errors:
@@ -457,7 +460,7 @@ class PlaybookCallbacks(object):
             while True:
                 result = prompt(msg, private)
                 second = prompt("confirm " + msg, private)
-                if result == second: 
+                if result == second:
                     break
                 print "***** VALUES ENTERED DO NOT MATCH ****"
         else: