background logging doesn't work as expected

[kasperk81]

On linux:

$ sudo usbmuxd -v -f

runs the daemon in foreground with verbose logging. If we hotplug, unplug then hotplug the device, it shows logs about those events as expected.

when running it in background:

$ sudo usbmuxd -v -l /tmp/usblogs

and tailing the logs (tail -f /tmp/usblogs) shows only the initial chunk of log, any interaction with the device (unplug, hotplug to mount) doesn't show subsequent logs.