configs/BeagleBone : Fix path to ReadTemp.py

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
configs/BeagleBone : Update path to pru_generic.bin

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
scripts/latency-test : Remove base thread by default
The defualt 25 uS base thread will crash low performance systems
that have greater than 25 uS interrupt latency.

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>