During functional testing against 11.5.4, traffic_group test fails in cm
During functional testing against 11.5.4, traffic_group test fails in cm

Issues:
Fixes #565

Problem:
When running functional tests against 11.6.0, this test
(test/functional/cm/test_traffic_group.py::TestTrafficGroups::test_device)
passes, but against 11.5.4 it fails with an error that the attribute
'mac' does not exist.

Analysis:
Create a new test which runs on both versions and renamed the old test to
set it to run against 11.6.0 and above.

Tests:
New tests pass against 11.6.0 and 11.5.4. Tests still failing against
11.5.4 however, but we'd slowly fixing them.

F5Networks/f5-common-python,F5Networks/f5-common-python