Revert "covers 3D avm tet brick"

This reverts commit 29c982c.

src/ref_import_test.c

@@ -202,25 +202,6 @@ int main(int argc, char *argv[]) {
     REIS(0, remove(file), "test clean up");
   }
 
-  { /* export import .avm tet brick */
-    REF_GRID export_grid, import_grid;
-    char file[] = "ref_import_test.avm";
-    RSS(ref_fixture_tet_brick_grid(&export_grid, ref_mpi), "set up tet");
-    RSS(ref_export_by_extension(export_grid, file), "export");
-    RSS(ref_import_by_extension(&import_grid, ref_mpi, file), "import");
-    REIS(ref_node_n(ref_grid_node(export_grid)),
-         ref_node_n(ref_grid_node(import_grid)), "node count");
-    REIS(ref_cell_n(ref_grid_qua(export_grid)),
-         ref_cell_n(ref_grid_qua(import_grid)), "qua count");
-    REIS(ref_cell_n(ref_grid_tri(export_grid)),
-         ref_cell_n(ref_grid_tri(import_grid)), "tri count");
-    REIS(ref_cell_n(ref_grid_tet(export_grid)),
-         ref_cell_n(ref_grid_tet(import_grid)), "tet count");
-    RSS(ref_grid_free(import_grid), "free");
-    RSS(ref_grid_free(export_grid), "free");
-    REIS(0, remove(file), "test clean up");
-  }
-
   { /* export import .meshb tet brick, version 2 */
     REF_GRID export_grid, import_grid;
     char file[] = "ref_import_test_ver2.meshb";