This is essential to make sure, that we won't use the same pipe descriptor for
different pipes.
Otherwise we can run into problem with fd send via unix sockets.
Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Tested-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>