Fix bugs of port discovery

fix(rpc_helper): the port discovery not working on a large offset

The port number is not valid when the number suffixed the node name
is too large.

Stateless port discovery

Support port_discovery = stateless.

Fix crash when active closing sockets

Fix acceptor: do not crash on closed socket when setting opts

If the socket (port) is closed (by client) before sending
any data, acceptor may crash when setting active option.
In this commit, the error posix code is captured and logged,
then acceptor can stop.

Switch lager to logger

2.3.0

Change lager to OTP logger (#3)