Go-criu clean up

The Go bindings for CRIU and the P.Haul extension have been moved into
a separate repository.

This patch removes the following from the criu-dev branch:

- lib/go/*
- phaul/*
- scripts/travis/phaul

The removed files are available in

https://github.com/checkpoint-restore/go-criu



Signed-off-by: Radostin Stoyanov <rstoyanov1@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>