[patch] hashcache fixes

[Andrew Bennetts]

On Sun, Jul 09, 2006 at 05:46:05PM +1000, Martin Pool wrote:
[...]
> We can fix both these at once by adding a window of a few seconds, which
> is what this patch does.  It also separates out and cleans up some
> tests:
> 
>  - pause for files to age for hashcache must now wait longer.

It's a shame to have tests that stop the test suite for 5 seconds.  It always
feels like an unsatsifactory hack to me.  Would it be better to directly update
the mtime of those files in the tests instead?

I guess the downside is that an "age_file" rather than "pause" function would
be slightly more complex (to implement, and to explain).

-Andrew.