Comment 2 for bug 1809643

Reviewed: https://review.openstack.org/627087
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=e83e5618b7ca71fb96bf460922480b9808b431b6
Submitter: Zuul
Branch: master

commit e83e5618b7ca71fb96bf460922480b9808b431b6
Author: aojeagarcia <email address hidden>
Date: Sun Dec 23 23:43:38 2018 +0100

    Don't modify global variables in unit tests

    The unit test
    test_enable_dhcp_helper_enable_metadata_nonisolated_dist_network
    modifies the global variables fake_port1, fake_port2, creating flakiness
    on unit tests that use those variables when execured in environments
    with high concurrency.

    Creating a deepcopy of the variable avoid that those changes can be
    propagated to other unit tests.

    Closes-Bug: #1809643

    Change-Id: Idfd0e99739952baf4d7b545b406cd1b251deb5f8
    Signed-off-by: aojeagarcia <email address hidden>