[fusefs] When I'm poking around anyway, change cache ttl handling.
[fusefs] When I'm poking around anyway, change cache ttl handling.

Cleanup only runs if ttl seconds have passed since last time. Checking if
things are older than now - ttl makes whatever caused the cleanup to run
last time to most likely stick around. Seems better to be a little more
aggressive.

drougge/wellpapp-pyclient