The hiddev driver has been in the "usbmisc" subsystem since kernel 3.7.0
or so. As such, we can simply drop the "usb" subsystem from our matches
at this point.
Otherwise we flush out the data much more often than needed. With this
change, we'll also wait up to 5 seconds even on lower power. Loosing 5s
of data shouldn't be too bad, and it may prevent additional disk writes.
But, more importantly, we need to deferre writing the data to a later
main loop iteration. If we did not do this, then we have an
write-amplification scenario where the history is written at least 4
times instead of once.
Closes: #150
The changes from 37b6d4b039 ("linux: Fix Bluetooth tests for
python-dbusmock changes") require a not-yet-released dbusmock version.
Simply catch the error and fall back to adding the properties in order
to be compatible with both old and new dbusmock versions of the bluez
service.
