Comment 2 for bug 1798317

Reviewed: https://review.openstack.org/611068
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=d595c3606c9c1c1829e3e0b283fd3409d74f1cde
Submitter: Zuul
Branch: master

commit d595c3606c9c1c1829e3e0b283fd3409d74f1cde
Author: Lucas Alvares Gomes <email address hidden>
Date: Tue Oct 16 14:38:11 2018 +0100

    Make connectivity test less backend dependent

    The test_connectivity_between_vms_on_different_networks should assert
    connectivity between different VMS on different networks but the test is
    also asserting that one VM can ping the services port (such as DHCP)
    running on the other network and that may not be the case for all
    backends.

    OVN for example uses a "localport" type to implement a
    DHCP port. That port type in OVN does not allow traffic
    outside the network it belongs to [0] which is causing the test
    test_connectivity_between_vms_on_different_networks to fail when used
    with networking-ovn.

    This patch is modifying the test to only ping the relevant ports when
    asserting that the VMs have connectivity with each other.

    [0]
    https://github.com/openvswitch/ovs/blob/d9677a1f0eaf6352c44af3ba3a4c2faf76a2a39b/ovn/controller/physical.c#L1176-L1182

    Closes-Bug: #1798317
    Change-Id: Ia4a6ee65d3d737f8452b4aed9bf4624455a3b050