signalling server doesn't reload cert file when it's updated, requires a manual restart

[thbaja]

for https://webrtc.nirbheek.in:8443

[tp-m]

cc @nirbheek

[nirbheek]

Oof. The same old problem where when the certificate gets updated, the signalling server doesn't reload the cert file. I've restarted the server, but this should be fixed. Updating issue name.

[nirbheek]

Well, I tried the suggestion in https://stackoverflow.com/a/43875481 to re-instantiate the asyncio server, but it didn't really work (ssl connections started just failing after the reload). Going to try and investigate that a bit more and if it doesn't work, will just implement a restart + inotify behind an option.

Most production deployments I know of put the signalling server behind an nginx proxy anyway.