increase USB timeout (#475)
increase USB timeout (#475)

* increase USB timeout

Doing a bunch of USB disk IO was killin' the capture on my rPi. Bumping
up to 1500ms allowed capture to run successfully while copying lots of
data.

* bump to 5000ms
thomasjacquin/allsky,thomasjacquin/allsky,thomasjacquin/allsky