Automatically unmount http mounts after some time
@alexl
Submitted by Alexander Larsson Assigned to gvf..@..e.bugs
Link to original bug (#509609)
Description
When a http share has not been used for a while we should unmount it to avoid wasting resources.
Ideally we should implement this is in a generic way (especially the detecting of when the backend is used) so that other automatically mounted backends can use this if they want.