Comment 3 for bug 1801306

Reviewed: https://review.openstack.org/612733
Committed: https://git.openstack.org/cgit/openstack/neutron-tempest-plugin/commit/?id=6f9bb77d9872a1cac4e1815ce13d97b8a143b3a8
Submitter: Zuul
Branch: master

commit 6f9bb77d9872a1cac4e1815ce13d97b8a143b3a8
Author: Federico Ressi <email address hidden>
Date: Tue Oct 23 17:35:47 2018 +0200

    Fix race condition in test_security_groups

    Listing security groups and taking the first one to change
    rules doesn't give any warranty listed security group is
    exactly the one used to create servers ports.

    This avoids this problem by creating a security group and
    passing it to server instead of having to search for it
    after the server has been created.

    Despite a test cases require a general refactory this should
    at least fix the CI job intermittent failures related to
    this test.

    Partial-Bug: #1801306
    Change-Id: I5ecb3c8711e7455e7f1588943a2ffd08ce154578