Trim /proc & /sys subtrees before mounting new instances
Both /proc and /sys may have sub-mounts in them from the host
OS. We must explicitly unmount them all before mounting the
new instance over that location. If we don't then /proc/mounts
will show the sub-mounts as existing, even though nothing will
be able to access them, due to the over-mount.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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