Configure rsyslog to listen over a unix domain socket instead of a port

- Add a placeholder rsyslog.conf so it doesn't fail on start
 - Create access restricted directory for unix socket to be created in
 - Create RSyslogHandler to exit early when logging socket doesn't exist
 - Write updated logging settings when dispatcher comes up and restart rsyslog so they  take effect
 - Move rsyslogd to the web container and create rpc supervisor.sock
 - Add env var for supervisor.conf path

awx/main/utils/handlers.py

@@ -3,10 +3,20 @@
 
 # Python
 import logging
+import os.path
 
 # Django
 from django.conf import settings
 
+
+class RSysLogHandler(logging.handlers.SysLogHandler):
+
+    def emit(self, msg):
+        if not os.path.exists(settings.LOGGING_SOCK):
+            return
+        return super(RSysLogHandler, self).emit(msg)
+
+
 ColorHandler = logging.StreamHandler
 
 if settings.COLOR_LOGS is True: