The current supervisord condifguration sets up the HTTP server
to listen on a tcp socket which is private i.e. available only
on localhost. This poses a regression where multiple containers
cannot be run if the host network interface is used when docker
container is run with `--network host` option.
This change adds a new env variable `SUPERVISOR_SERVER`, with
potential values `unix | private_port | public_port`, where
`unix` is set as the default value.
By default, the HTTP server is now set to listen on a UNIX
domain socket.
The file path is set to `/etc/supervisor/supervisor.sock`
instead of the /tmp directory since some systems
periodically delete older files in /tmp. If the socket file is
deleted, supervisorctl will be unable to connect to supervisord.
When SUPERVISOR_SERVER is set to `public_port` or `private_port`,
the HTTP server is set to listen on a TCP socket.
Resolves https://github.com/storj/storj/issues/4661
Change-Id: I224836dcae0293bcfe49874f2748be7723944687
87ea2a4794