Change test group for separate haproxy test

- Change multiracks_2 group of separate_haproxy test
because multiracks_2 group is used for the tests
with other devops template

Change-Id: Ic38890a7cadc2869b30be0f92ae879fd1a5823a9

fuelweb_test/tests/tests_separate_services/test_separate_haproxy.py

@@ -31,7 +31,7 @@ from fuelweb_test.tests.test_net_templates_base import TestNetworkTemplatesBase
 from gates_tests.helpers import exceptions
 
 
-@test(groups=["multiracks_2"])
+@test(groups=["thread_separate_haproxy"])
 class TestSeparateHaproxy(TestNetworkTemplatesBase):
     """Test for verification of deployment with detached haproxy role."""