Cannot get connection id for node error in OTP 21.0

[Sarat Chandra]

In Erlang/OTP 21, we are getting Cannot get connection id for node error. This is due to change in OTP 21 where self connecting is an error, where it is previously ignored.

Erlang/OTP 21 [erts-10.0.1] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]

Interactive Elixir (1.6.6) - press Ctrl+C to exit (type h() ENTER for help)
iex(machine@1ccb50f51a40)1> Node.connect(node())
07:16:38.764 [error]  ** Cannot get connection id for node :machine@1ccb50f51a40
false

Same issue occured in libcluster as well: bitwalker/libcluster#70

This should be solved by not self connecting. I can work on it and send a PR.