net.server_epoll: Handle missing ports from getsock/peername (as in the case of unix sockets)

net.server: Switch to epoll backend by default (if util.poll is found)

net.server_select: Pass conn/handler to readbuffer/sendbuffer The internal implementations don't use it, but this causes onreadable and onwritable of watchfd to receive the conn as they do in other backends.

net.server_select: Ensure onconnect is always called before onincoming This changes the code to call onconnect when the first data is sucessfully read or written, instead of simply when the socket first becomes writable. A writable socket can mean a connection error, and if the client already sent some data it may get passed to onincoming before processing writable sockets. This fixes the issue.

mod_c2s,mod_s2s: Make stanza size limits configurable

mod_c2s,mod_s2s: Use a distinct stream error for hitting stanza size limit Since this is not a real parse error, it should not be reported as such.

scansion: Add test for mod_server_contact_info / XEP-0157

net.server_epoll: Fix typo in internal method name

net.server_epoll: Log some noise before TLS handshake step This would help pinpoint if a crash happens during the handshake, which has occurred a few times, e.g. like https://github.com/brunoos/luasec/issues/75

mod_admin_telnet: Update existing sessions on reload This removes the need to disconnect and reconnect to the telnet console for changes to take effect.