Update containers/storage to pick up overlay driver fix

New pinned commit is ff8a6d2bf496daf46ab1a153f783a0f6b8762a54

This includes a fix to error reporting with overlayfs, and will
produce more verbose errors when initializing overlayfs fails.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #546
Approved by: baude
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