This is a port of 31a6449734 ("Add capability for snapshotters to
declare support for UID remapping") to sbserver.
This patch remaps the rootfs in the platform-specific if user namespaces
are in use, so the pod can read/write to the rootfs.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
Currently there is a big c&p of the helpers between these two folders
and a TODO in the platform agnostic file to organize them in the future,
when some other things settle.
So, let's just copy them for now.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
