[fix] xfail test_055_delete_evc_after_restart_kytos_and_no_switch_reconnected

[viniarck]

Related to issue #187 (only addresses one of the test cases there for now), the other ones will be picked up gradually as the team is fixing tests.

Local Tests

+ python3 -m pytest --timeout=600 tests/ -k test_055_delete_evc_after_restart_kytos_and_no_switch_reconnected
============================= test session starts ==============================
platform linux -- Python 3.9.2, pytest-7.2.0, pluggy-1.0.0
rootdir: /tests
plugins: rerunfailures-10.2, timeout-2.1.0
timeout: 600.0s
timeout method: signal
timeout func_only: False
collected 199 items / 198 deselected / 1 selected

tests/test_e2e_10_mef_eline.py .                                         [100%]

=============================== warnings summary ===============================
usr/local/lib/python3.9/dist-packages/kytos/core/config.py:186
  /usr/local/lib/python3.9/dist-packages/kytos/core/config.py:186: UserWarning: Unknown arguments: ['--timeout=600', 'tests/', '-k', 'test_055_delete_evc_after_restart_kytos_and_no_switc
h_reconnected']
    warnings.warn(f"Unknown arguments: {unknown}")

test_e2e_10_mef_eline.py: 17 warnings
  /usr/lib/python3/dist-packages/mininet/node.py:1121: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
    return ( StrictVersion( cls.OVSVersion ) <

test_e2e_10_mef_eline.py: 17 warnings
  /usr/lib/python3/dist-packages/mininet/node.py:1122: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
    StrictVersion( '1.10' ) )

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
------------------------------- start/stop times -------------------------------
========== 1 passed, 198 deselected, 35 warnings in 87.02s (0:01:27) ===========