Setting LC_MESSAGES: prevent unparseable messages

This locale variable defines how tools should display their messages.
This is for example gonna change the yum message from "Nothing to do" to
"Rien a faire" in my case (french).

As the yum module parses that string in err, if the message is not
enforced in english this is gonna fail.

So this commits just enriches a bit more the code that's already written
for that enforcement.

This commit fixes issue #9635.

lib/ansible/module_utils/basic.py

@@ -772,6 +772,7 @@ class AnsibleModule(object):
             locale.setlocale(locale.LC_ALL, 'C')
             os.environ['LANG']     = 'C'
             os.environ['LC_CTYPE'] = 'C'
+            os.environ['LC_MESSAGES'] = 'C'
         except Exception, e:
             self.fail_json(msg="An unknown error was encountered while attempting to validate the locale: %s" % e)