Refactor message generator

* Job object can now control the output and generate K:V output for
  notification types that can support it
* Notifications store the body as json/dict now to encode more
  information
* Notification Type can further compose the message based on what is
  sensible for the notification type
* This will also allow customizing the message template in the future
* All notification types use sane defaults for the level of detail now

awx/main/notifications/irc_backend.py

@@ -7,11 +7,11 @@ import logging
 
 import irc.client
 
-from django.core.mail.backends.base import BaseEmailBackend
+from awx.main.notifications.base import TowerBaseEmailBackend
 
 logger = logging.getLogger('awx.main.notifications.irc_backend')
 
-class IrcBackend(BaseEmailBackend):
+class IrcBackend(TowerBaseEmailBackend):
 
     init_parameters = {"server": {"label": "IRC Server Address", "type": "string"},
                        "port": {"label": "IRC Server Port", "type": "int"},