Switch group regex to parallel-class

mtreinish · mtreinish · commit 692c33f3a937 · 2019-11-14T14:47:30.000-05:00
diff --git a/.stestr.conf b/.stestr.conf
@@ -1,3 +1,3 @@
 [DEFAULT]
 test_path=./test/terra
-group_regex=(test.terra.backends.test_qasm_matrix_product_state|test.terra.backends.test_qasm_mps_simulator)
+parallel_class=True
