GPU Scheduling - add an example discovery Script

We should add an example script that can be used to discovery GPU's and output the correctly formatted JSON.

Something like below, but it needs to be tested on various systems with more then 2 gpu's:

ADDRS=`nvidia-smi --query-gpu=index --format=csv,noheader | sed 'N;s/\n/\",\"/'`
COUNT=`echo $ADDRS | tr -cd , | wc -c`
ALLCOUNT=`expr $COUNT + 1`
#echo {\"name\": \"gpu\", \"addresses\":[\"$ADDRS\"]}