rbd: support cloning across namespaces
If parent_get class method is not supported by the OSDs, fall back to the legacy class method and assume that the parent is in the default (i.e. "") namespace. The "use the child's image namespace" workaround is no longer needed because creating images within namespaces will require parent_get aware OSDs. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Jason Dillaman <dillaman@redhat.com>
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