message: update shared ptr make for MPIConfig
diff: #include <net/mpi/mpi_communicator.hpp>
  std::shared_ptr<cylon::CylonContext> ctx = NULL;
  +
  int RANK = 0;
  int WORLD_SZ = 0;
  @@ -33,7 +34,7 @@ using namespace cylon;
  int main(int argc, char *argv[]) {
  // global setup...
  - auto mpi_config = std::shared_ptr<cylon::net::MPIConfig>();
  + auto mpi_config = std::make_shared<cylon::net::MPIConfig>();
  ctx = cylon::CylonContext::InitDistributed(mpi_config);
  RANK = ctx->GetRank();
  WORLD_SZ = ctx->GetWorldSize();
  