Add a convenience shell script for Docker container C/R

Since the command line for checkpointing and restoring Docker containers
is very long and there are some manual steps involved before restoring
a container, it's much easier to use a shell script to automate the work.

One would simply do:

$ sudo docker_cr.sh -c
$ sudo docker_cr.sh -r

Signed-off-by: Saied Kazemi <saied@google.com>
Acked-by: Filipe Brandenburger <filbranden@google.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
scripts: Fix path assignment

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
restore: use root_as_sibling only after defining it

root_as_sibling was used in criu_signals_setup(), but was only defined later
(when forking the root task for the first time). This meant that the
SA_NOCLDSTOP was never masked off, which meant SIGCHLD was never delivered
after ptracing the root task. Thus, when the a child of the root task died
(e.g. from cr_system), the root task sat in PTRACE_STOP, and the restore task
never PTRACE_CONT'd, resulting in a deadlock.

Instead, we only unmask SA_NOCLDSTOP right before we PTRACE_SEIZE, after the
value is defined.

v2: re-work the condition for CLONE_PARENT
v3: move unmasking of SA_NOCLDSTOP to restore_root_task
v4: keep all the comments in the original code

Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>