Simplify zaqar endpoint detection in tests

Use environment variables used in devstack to detect endpoints. Also
in CI we can make zaqar bind localhost to use the static address.

Change-Id: Ia6d0fb3322ae2faf4c5b30f833e9b82292599747

.zuul.yaml

@@ -7,6 +7,8 @@
       - opendev.org/openstack/zaqar
       - opendev.org/openstack/zaqar-tempest-plugin
     vars:
+      devstack_localrc:
+        ZAQAR_SERVICE_HOST: localhost
       devstack_plugins:
         zaqar: https://opendev.org/openstack/zaqar
       devstack_services:
@@ -24,6 +26,8 @@
       # when they have been enabled again by a native Zuul v3 job.
       # The failing job can be checked by removing this filter.
       tox_extra_args: -vv -- tests.functional.queues.v2.test_health
+      tox_environment:
+        ZAQAR_SERVICE_HOST: localhost
 
 - project:
     templates:

tox.ini

@@ -35,6 +35,8 @@ setenv =
   OS_TEST_PATH = ./tests/functional
   ZAQARCLIENT_AUTH_FUNCTIONAL = 1
   ZAQARCLIENT_TEST_FUNCTIONAL = 1
+passenv =
+  ZAQAR_SERVICE_HOST
 
 [testenv:venv]
 commands = {posargs}

zaqarclient/tests/queues/base.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import subprocess
+import os
 from unittest import mock
 
 from oslo_utils import netutils
@@ -22,18 +22,14 @@ from zaqarclient.queues import client
 from zaqarclient.tests import base
 from zaqarclient.tests.transport import dummy
 
-cmd = 'cat /etc/zaqar/uwsgi.conf | grep http'
-MY_HOST_IP = subprocess.run(cmd, shell=True, capture_output=True, text=True)
-if len(MY_HOST_IP.stdout.split("= ")) < 2:
-    MY_IP = netutils.get_my_ipv4() + ':8888'
-else:
-    MY_IP = MY_HOST_IP.stdout.split("= ")[1]
+
+MY_IP = os.environ.get('ZAQAR_SERVICE_HOST', netutils.get_my_ipv4())
 
 
 class QueuesTestBase(base.TestBase):
 
     transport_cls = dummy.DummyTransport
-    url = 'http://%s' % MY_IP
+    url = 'http://%s:8888' % netutils.escape_ipv6(MY_IP)
     version = 1
 
     def setUp(self):