overlay: use direct mount instead of mountFrom
overlay: use direct mount instead of mountFrom

prevent a recursion with the reexec program if the check for native
overlay is done in a "init()" function.

Signed-off-by: Giuseppe Scrivano <20002b7b24c75512093a71a58285826d5c504fca@redhat.com>

containers/storage,rhatdan/storage,rhatdan/storage,containers/storage,rhatdan/storage,containers/storage