GitLab

* ID service stream
* make the relay service use msmux
* fix nc tests

Note from jbenet: Maybe we should remove the old protocol/muxer
and see what breaks. It shouldn't be used by anything now.

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>
Signed-off-by: Juan Batiz-Benet <juan@benet.ai>