Adds provider flavor capabilities API tests

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

Change-Id: Ie4f9f72e011ee8aa30e8f9aa35558533839fb8c8
diff --git a/octavia_tempest_plugin/tests/test_base.py b/octavia_tempest_plugin/tests/test_base.py
index e85fb0a..12929f4 100644
--- a/octavia_tempest_plugin/tests/test_base.py
+++ b/octavia_tempest_plugin/tests/test_base.py
@@ -128,6 +128,8 @@
         cls.mem_flavor_client = cls.os_roles_lb_member.flavor_client
         cls.mem_provider_client = cls.os_roles_lb_member.provider_client
         cls.os_admin_servers_client = cls.os_admin.servers_client
+        cls.lb_admin_capabilities_client = (
+            cls.os_roles_lb_admin.flavor_capabilities_client)
 
     @classmethod
     def resource_setup(cls):