Add functional test cases for v3-ext/OS-OAUTH1

Add functional test cases for OS-OAUTH1 API
https://developer.openstack.org/api-ref/identity/v3-ext/index.html?expanded=#os-oauth1-api

Change-Id: I8d5921a3b2de273019b075e2ea0e3694344c6912
Depends-On: I4c5369ae3ad7a7add630e3ac6a4fc52f854bc77c
Closes-Bug: #1687593
diff --git a/keystone_tempest_plugin/tests/base.py b/keystone_tempest_plugin/tests/base.py
index 6ba6659..16f0092 100644
--- a/keystone_tempest_plugin/tests/base.py
+++ b/keystone_tempest_plugin/tests/base.py
@@ -36,6 +36,9 @@
         cls.auth_client = cls.keystone_manager.auth_client
         cls.idps_client = cls.keystone_manager.identity_providers_client
         cls.mappings_client = cls.keystone_manager.mapping_rules_client
+        cls.roles_client = cls.keystone_manager.roles_v3_client
         cls.saml2_client = cls.keystone_manager.saml2_client
         cls.sps_client = cls.keystone_manager.service_providers_client
         cls.tokens_client = cls.keystone_manager.token_v3_client
+        cls.consumers_client = cls.keystone_manager.oauth_consumers_client
+        cls.oauth_token_client = cls.keystone_manager.oauth_token_client