lbaas tests failure on queens gate

[YAMAMOTO Takashi]

neutron-lbaas tempest plugin assumes a released version of tempest.
networking-midonet gate jobs use tempest master.

eg. http://logs.openstack.org/57/597357/2/check/networking-midonet-tempest-aio-ml2-full/3de2abb/logs/testr_results.html.gz

ft8.1: setUpClass (neutron_lbaas.tests.tempest.v2.api.test_pools_admin.TestPools)_StringException: Traceback (most recent call last):
  File "/opt/stack/new/neutron-lbaas/neutron_lbaas/tests/tempest/v2/api/base.py", line 155, in setUpClass
    super(BaseTestCase, cls).setUpClass()
  File "tempest/test.py", line 172, in setUpClass
    six.reraise(etype, value, trace)
  File "tempest/test.py", line 165, in setUpClass
    cls.resource_setup()
  File "/opt/stack/new/neutron-lbaas/neutron_lbaas/tests/tempest/v2/api/test_pools_admin.py", line 52, in resource_setup
    vip_subnet_id=cls.subnet.get('id'))
  File "/opt/stack/new/neutron-lbaas/neutron_lbaas/tests/tempest/v2/api/base.py", line 173, in _create_load_balancer
    cls.ports.append(port['port'])
AttributeError: type object 'TestPools' has no attribute 'ports'

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/597357
Committed: https://git.openstack.org/cgit/openstack/networking-midonet/commit/?id=a71f447ce72c7408033ffd622270d8ffd9a588cd
Submitter: Zuul
Branch: stable/queens

commit a71f447ce72c7408033ffd622270d8ffd9a588cd
Author: YAMAMOTO Takashi <email address hidden>
Date: Tue Aug 28 11:39:18 2018 +0900

    Remove a few extensions from NETWORK_API_EXTENSIONS

    This commit removes the following extensions from the list.
     timestamp_core
     tag
     tag_ext

    Those extensions have been removed long before. [1] [2]
    The mismatch has been exposed by the recently added
    tempest test case. [3]

    [1] I2ee2ed4c713d88345adc55b022feb95653eec663
    [2] I97095453610fff114d999a526d67e78119546ff5
    [3] I4c59f407c30020e3865e96e67a1b61361e699014

    Also, make the grenade job non-voting for now because
    it would take long to fix it.
    1. It needs to be fixed in the base branch (right now
       it's stable/queens) as grenade uses the base branch's
       tempest.conf (thus NETWORK_API_EXTENSIONS) as it is
       for the target branch.
    2. Right now stable/queens gate is broken for unrelated reasons

    Closes-Bug: #1789323

    This commit includes the following unrelated changes to pass
    the gate.
    ----------------------------------------
    Disable rally job for now

    rally_openstack 1.2.0 doesn't seem compatible with queens.

    Related-Bug: #1792364
    ----------------------------------------
    Stop installing neutron-lbaas tempest plugin for now

    It doesn't seem compatible with tempest master.

    Related-Bug: #1792357
    ----------------------------------------

    Change-Id: Ib865c5b406097c5196d8a95cfefc6e5513c1e40d
    (cherry picked from commit 4ff0d09c9e68e7261c02c6f43a92a2e673dede60)