Brian Goff ca6a533d23 Fix error handling with not-exist errors on remove
Specifically, none of the graphdrivers are supposed to return a
not-exist type of error on remove (or at least that's how they are
currently handled).

Found that AUFS still had one case where a not-exist error could escape,
when checking if the directory is mounted we call a `Statfs` on the
path.

This fixes AUFS to not return an error in this case, but also
double-checks at the daemon level on layer remove that the error is not
a `not-exist` type of error.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: d42dbdd3d48d0134f8bba7ead92a7067791dffab
Component: engine
2017-07-20 12:26:27 -04:00
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