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

tools/docker-compose/supervisor.conf

@@ -72,7 +72,7 @@ stdout_logfile=/dev/fd/1
 stdout_logfile_maxbytes=0
 
 [program:awx-rsyslogd]
-command = rsyslogd -n -i /awx_devel/rsyslog.pid
+command = rsyslogd -n -i /var/run/tower/rsyslog/rsyslog.pid -f /var/lib/awx/rsyslog/rsyslog.conf
 autostart = true
 autorestart = true
 stopwaitsecs = 1