The only one (so far) "post-resume" script needs some pid to join its
namespaces. Let it be containers root.

v4:
1) Enviroonment setup has been was moved to run_scripts
2) Environment variable NS_PID was renamed to CRTOOLS_INIT_PID
Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>