update ImageNetApp instructions
update ImageNetApp instructions

amplab/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,amplab/SparkNet,rahulbhalerao001/SparkNet,rahulbhalerao001/SparkNet,amplab/SparkNet