Create api+scenario tests for members

This patch implements member tests for the Octavia
Tempest Plugin.

Depends-On: https://review.openstack.org/#/c/567955/
Change-Id: I8813f90538b9ec9047a1777b6cab76485a150498
Story: 2001387
Task: 5970
diff --git a/octavia_tempest_plugin/clients.py b/octavia_tempest_plugin/clients.py
index 27ebb89..7b766be 100644
--- a/octavia_tempest_plugin/clients.py
+++ b/octavia_tempest_plugin/clients.py
@@ -20,6 +20,8 @@
 from octavia_tempest_plugin.services.load_balancer.v2 import (
     loadbalancer_client)
 from octavia_tempest_plugin.services.load_balancer.v2 import (
+    member_client)
+from octavia_tempest_plugin.services.load_balancer.v2 import (
     pool_client)
 
 CONF = config.CONF
@@ -37,3 +39,5 @@
             self.auth_provider, SERVICE_TYPE, CONF.identity.region)
         self.pool_client = pool_client.PoolClient(
             self.auth_provider, SERVICE_TYPE, CONF.identity.region)
+        self.member_client = member_client.MemberClient(
+            self.auth_provider, SERVICE_TYPE, CONF.identity.region)