while adding tests, found out that io as hash of authority => io wasn't
working due to missing uri extensions. Made sure the same works for unix
sockets.
(This deprecates the :transport_options option)
This should be given an array of peer addresses to connect to. It can be
used when the destination IPs are known and you want to avoid resolving
them, and when the destination is a unix socket (and the destination is
a FS path)
