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/tests/test_base.py b/octavia_tempest_plugin/tests/test_base.py
index 596e7fb..47ea4ad 100644
--- a/octavia_tempest_plugin/tests/test_base.py
+++ b/octavia_tempest_plugin/tests/test_base.py
@@ -110,6 +110,7 @@
         cls.mem_member_client = cls.os_roles_lb_member.member_client
         cls.mem_healthmonitor_client = (
             cls.os_roles_lb_member.healthmonitor_client)
+        cls.mem_l7policy_client = cls.os_roles_lb_member.l7policy_client
 
     @classmethod
     def resource_setup(cls):