otp-23 support and new env var ERL_DIST_PORT
otp-23 support and new env var ERL_DIST_PORT

new parts of OTP-23 include setting remote_nodename to undefined
when caling for a remote console and using -address in erl_call

To support -address and to make epmdless easier the env var
ERL_DIST_PORT has been added. This port is used to set the
min and max listen port to it and used in -address so that
erl_call works for nodes not using epmd.

lrascao/relx,erlware/relx