Adds provider API tests

This patch adds provider API tests to the Octavia tempest plugin.

Change-Id: I25685276e12dd94e866f7db5b501baaa9a38cc84
diff --git a/octavia_tempest_plugin/tests/test_base.py b/octavia_tempest_plugin/tests/test_base.py
index 4ba5cae..f8acc2b 100644
--- a/octavia_tempest_plugin/tests/test_base.py
+++ b/octavia_tempest_plugin/tests/test_base.py
@@ -126,6 +126,7 @@
             cls.os_roles_lb_admin.flavor_profile_client)
         cls.lb_admin_flavor_client = cls.os_roles_lb_admin.flavor_client
         cls.mem_flavor_client = cls.os_roles_lb_member.flavor_client
+        cls.mem_provider_client = cls.os_roles_lb_member.provider_client
 
     @classmethod
     def resource_setup(cls):