Allow upgrades from an extracted folder #288
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This PR allows upgrades to happen from an extracted folder which allow a simple approach to upgrade using github.com/rancher/system-upgrade-controller/.
Also notice I change the rsync args. I ran into issue with using AX in a container, but I kind of prefer we don't rely on ACLs and xattrs to be preserved. Are ACLs and xattrs part of the OCI spec? I would think those attributes can't be relies on being the tars from a docker image.