vzctl: checkpoint/restoer of upstream CTs

It can be done by any third party tools.
sripts/ct-cpt and script/ct_rst are executed to dump and restore CT
This patch adds scripts for CRIU.

v2: add the GPL header and descriptions in scripts
    describe and check variables in scripts

Signed-off-by: Andrey Vagin <avagin@openvz.org>
5 files changed