#13: Move test cases for RDDChunk, ChunkIterator, GpuRDD, etc to their
own test suite files 

This commit moves the RDDChunk test cases to
org.apache.spark.gpu.RDDCgubkSuit

Task-Url: http://github.com/meisam/spark/issues/issue/13
#13: Move test cases for RDDChunk, ChunkIterator, GpuRDD, etc to their
own test suite files

This commit moves GpuRDD test cases to GpuRDDSuit

Task-Url: http://github.com/meisam/spark/issues/issue/13