Arla 0.7.2 returns stale cached metadata on Linux 2.0

[Magnus Ahltorp]

> At least on Linux 2.0.34, Arla 0.7.2 doesn't appear to notice changes
> made to vnodes on other machines, though it does notice changes to the
> actual data:

There have been _lots_ of changes done to the linux code since 0.7.2,
and I hope that I have already solved your problem. Please try out the
new release that will be out today.

/Magnus
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