message: Addressing Jason B. PR requests:  re-adding two includes + rm Kokkos_Core
  header
diff: #include "RAJA/config.hpp"
  #include "rajaperf_config.hpp"
  -#if defined(RUN_KOKKOS)
  -#include "Kokkos_Core.hpp"
  -#endif // RUN_KOKKOS
  +#include <ostream>
  +#include <string>
  namespace rajaperf
  {
  