Add OverlayFS support to docker_cr.sh
The main purpose of this patch is to add OverlayFS support to docker_cr.sh for external checkpoint and restore. It also does a bit of cleaning and minor enhancements. Signed-off-by:Saied Kazemi <saied@google.com> Signed-off-by:
Pavel Emelyanov <xemul@parallels.com>
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