Fix up mongo service handline and task logging

* Use -f instead of -c for mongod when refernecing config file
  for shutdown behavior in the stop task
* Fix up task logging to use new supervisor configuration syntax

awx/main/tasks.py

@@ -140,7 +140,7 @@ def mongodb_control(cmd):
 
     if cmd == 'stop':
         time.sleep(30)
-        p = subprocess.Popen('sudo mongod --shutdown -c /etc/mongod.conf')
+        p = subprocess.Popen('sudo mongod --shutdown -f /etc/mongod.conf')
         out, err = p.communicate()
         logger.info("Shutdown command output: %s;%s" % (out, err))