jenkins: add script to create a test container

We want to execute tests in an isolated environment
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/jenkins/_run_ct

+#!/bin/sh
+
+set -e
+mount --make-rprivate /
+umount -l  /proc
+mount -t proc proc /proc/
+exec "$@"

test/jenkins/run_ct

+#!/bin/sh
+
+unshare --mount --pid --fork -- $(readlink -f `dirname $0`/_run_ct) "$@"