* Increase sizes of tcp rcv and snd bufffers
* Fill buffers
* Dump/Restore
* Check, that all data were restored

This test reproduces a problem from buf #2411

v2: don't use test_waitsig() in external processes, because they
   can be out of this pid name-space.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>