message: Remove redundant header includes in mpi_utils.h
  In `mpi_utils.h` the header `"tensorflow/core/platform/logging.h"`
  was included twice.
  This fix removes redundant header includes
diff: @@ -24,7 +24,6 @@ limitations under the License.
  #include "tensorflow/core/platform/logging.h"
  #include "tensorflow/core/lib/strings/str_util.h"
  -#include "tensorflow/core/platform/logging.h"
  // Skip MPI C++ bindings support, this matches the usage in other places
  #define OMPI_SKIP_MPICXX
  