Fix credential naming

Change-Id: Ica935f22ed30792033c6c36742abead20de66363
diff --git a/doc/source/index.rst b/doc/source/index.rst
index b5770f2..b7053a1 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -166,7 +166,7 @@
        def setup_clients(cls):
            super(ZonesTest, cls).setup_clients()
 
-           cls.client = cls.os.zones_client
+           cls.client = cls.os_primary.zones_client
 
        @decorators.attr(type='smoke')
        @decorators.idempotent_id('fbabd6af-238a-462e-b923-de4d736b90a7')
@@ -200,8 +200,8 @@
        def setup_clients(cls):
            super(ZonesAdminTest, cls).setup_clients()
 
-           cls.client = cls.os.zones_client
-           cls.adm_client = cls.os_adm.zones_client
+           cls.client = cls.os_primary.zones_client
+           cls.adm_client = cls.os_admin.zones_client
 
        @decorators.idempotent_id('6477f92d-70ba-46eb-bd6c-fc50c405e222')
        def test_get_other_tenant_zone(self):