userdb cache expiry

[Havoc Pennington]

Tim Dijkstra wrote:
> 
> Why doesn't dbus just rely on the OS to do the caching? On linux, nscd
> exist for this purpose for example ...
> 

It was just too slow, I forget why but there were a *lot* of lookups. 
Maybe the real issue was just when running the test suite.

This is something that should be fixed, I agree. As a first pass you 
could try hacking the cache so it never caches anything and see what 
difference it makes in time to run "make check" - probably better to 
develop a simple real-world benchmark, though.

Havoc