Cleanup KokkosHelpers (class -> namespace)
Cleanup KokkosHelpers (class -> namespace)

Rombur/DataTransferKit,dalg24/DataTransferKit,ORNL-CEES/DataTransferKit,dalg24/DataTransferKit,ORNL-CEES/DataTransferKit,dalg24/DataTransferKit,Rombur/DataTransferKit,dalg24/DataTransferKit,ORNL-CEES/DataTransferKit,Rombur/DataTransferKit,ORNL-CEES/DataTransferKit,Rombur/DataTransferKit