[rdma] Tests traffic behavior with unknown mac

[neethajohn]

Signed-off-by: Neetha John [email protected]

Description of PR

Test traffic behavior on lossless and lossy priorities when sent to destination with unknown mac

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

How did you verify/test it?

platform linux2 -- Python 2.7.12, pytest-4.6.9, py-1.8.1, pluggy-0.13.1 -- /usr/bin/python
cachedir: .pytest_cache
ansible: 2.8.7
rootdir: /var/nejo/Networking-acs-sonic-mgmt/tests, inifile: pytest.ini
plugins: ansible-2.2.2
collected 3 items                                                                                                                                                                        

pfc/test_unknown_mac.py::TestUnknownMac::test_unknown_mac[dscp-3] PASSED                                                                                                           [ 33%]
pfc/test_unknown_mac.py::TestUnknownMac::test_unknown_mac[dscp-4] PASSED                                                                                                           [ 66%]
pfc/test_unknown_mac.py::TestUnknownMac::test_unknown_mac[dscp-8] PASSED                                                                                                           [100%]

=============================================================================== 3 passed in 158.54 seconds ===============================================================================

[yxieca]

We should also add IPv6 test