Create api+scenario tests for l7policies

This patch implements l7policy tests for the Octavia
Tempest Plugin.

Depends-On: https://review.openstack.org/#/c/571997/
Change-Id: I58061cd69704da80e48c0963b6639ff8d6051c01
Story: 2001387
Task: 5976
diff --git a/octavia_tempest_plugin/clients.py b/octavia_tempest_plugin/clients.py
index 1bf1ebf..bb08c3b 100644
--- a/octavia_tempest_plugin/clients.py
+++ b/octavia_tempest_plugin/clients.py
@@ -18,6 +18,8 @@
 from octavia_tempest_plugin.services.load_balancer.v2 import (
     healthmonitor_client)
 from octavia_tempest_plugin.services.load_balancer.v2 import (
+    l7policy_client)
+from octavia_tempest_plugin.services.load_balancer.v2 import (
     listener_client)
 from octavia_tempest_plugin.services.load_balancer.v2 import (
     loadbalancer_client)
@@ -45,3 +47,5 @@
             self.auth_provider, SERVICE_TYPE, CONF.identity.region)
         self.healthmonitor_client = healthmonitor_client.HealthMonitorClient(
             self.auth_provider, SERVICE_TYPE, CONF.identity.region)
+        self.l7policy_client = l7policy_client.L7PolicyClient(
+            self.auth_provider, SERVICE_TYPE, CONF.identity.region)