Parallelize the test validation for ColumnSuite.
Parallelize the test validation for ColumnSuite.

alabid/blinkdb,vax11780/shark,lzshlzsh/shark,mattyb149/blinkdb,amplab/shark,lzshlzsh/shark,sameeragarwal/blinkdb_dev,alabid/blinkdb,vax11780/shark,amplab/shark,mattyb149/blinkdb,sameeragarwal/blinkdb,alabid/blinkdb,mapr/shark,mattyb149/blinkdb,sjyk/sampleclean,sameeragarwal/blinkdb,sameeragarwal/blinkdb_dev,mapr/shark,sjyk/sampleclean,sameeragarwal/blinkdb_dev,sameeragarwal/blinkdb,vax11780/shark,sjyk/sampleclean,amplab/shark,mapr/shark,lzshlzsh/shark