Makes daphne websocket_timeout infinite.

Daphne has a default timeout of 86400 seconds, so after 1 day of starting
awx_web container, the stdout stops refreshing automatically on the web UI.
This fixes this issue by making the timeout infinite, so the connection
between nginx and daphne's websocket never closes.

installer/roles/image_build/files/supervisor.conf

@@ -25,7 +25,7 @@ stderr_logfile=/dev/stderr
 stderr_logfile_maxbytes=0
 
 [program:daphne]
-command = /var/lib/awx/venv/awx/bin/daphne -b 127.0.0.1 -p 8051 awx.asgi:channel_layer
+command = /var/lib/awx/venv/awx/bin/daphne -b 127.0.0.1 -p 8051 --websocket_timeout -1 awx.asgi:channel_layer
 directory = /var/lib/awx
 autostart = true
 autorestart = true