[CRIU] [PATCH] test, pipes: Exhaustive test of shared pipes

[Pavel Emelyanov]

OK, I've run myself. Patches pass this test, but fail the sent previously
unix test.

I did it like this:

./unix.py --depth 10 --sockets 3 --stream --keep

This test fails even on criu-dev, but failures are about lost socket name
(which is bad, but not critical) and lost pending connection (which is very
bad, we'll need to fix it).

With your patches applied the test additionally fails with 'cannot restore'
reason, which is also very bad. E.g. this state dumps, but doesn't restore:

	socket(S) = 1
	socket(S) = 2
	socket(S) = 3
	bind(1, $name-1)
	listen(1)
	connect(2, $name-1)
	bind(3, $name-3)
	listen(3)

In restore log:
(00.022915)  26472: Error (criu/sk-unix.c:924): sk unix: Can't connect 0x79f4ee socket: Bad file descriptor

-- Pavel