Sometimes it's more convenient to be able to specify where to connect on
the connect() statement, let's make it possible to pass it in argument to
the C command.
The following directories were moved from contrib/ to dev/ to make their
use case a bit clearer. In short, only developers are expected to ever
go there. The makefile was updated to build and clean from these ones.
base64/ flags/ hpack/ plug_qdisc/ poll/ tcploop/ trace/
