add test for extracting data blobs from net
add test for extracting data blobs from net

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