criu: Version 1.4

So, according to the recently accepted plan we have 1.4.

Biggest achievement here is that we've finally started with
user namespaces, fixed CRIU to work smoothly with the p.haul
project and optimized images and /proc files IO.

And a bunch of bugs, of course.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>