Set a default region for clients

Clients initialized for tests.api.* tests do not have defined values
for region [1]. Because of that the clients connect to the first
available service endpoint that they find (see this line in
tempest [2]). This can cause issues when there are multiple endpoints
on a system for barbican (admin, internal, public).

This change sets a default value for key_manager.region config option
to 'regionOne' and ensures that clients defined on the side of
barbican-tempest-plugin are intialised with this value.

[1] https://opendev.org/openstack/barbican-tempest-plugin/src/branch/master/barbican_tempest_plugin/tests/api/base.py#L91
[2] https://opendev.org/openstack/tempest/src/branch/master/tempest/lib/auth.py#L586

Change-Id: Ic9ae00c663cca6b83dc961b984cf129d1c33afc4
diff --git a/barbican_tempest_plugin/tests/api/base.py b/barbican_tempest_plugin/tests/api/base.py
index c098978..aa500f7 100644
--- a/barbican_tempest_plugin/tests/api/base.py
+++ b/barbican_tempest_plugin/tests/api/base.py
@@ -81,22 +81,16 @@
     def setup_clients(cls):
         super(BaseKeyManagerTest, cls).setup_clients()
         os = getattr(cls, 'os_%s' % cls.credentials[0])
-        cls.consumer_client = os.secret_v1.ConsumerClient(
-            service='key-manager'
-        )
-        cls.container_client = os.secret_v1.ContainerClient(
-            service='key-manager'
-        )
-        cls.order_client = os.secret_v1.OrderClient(service='key-manager')
-        cls.secret_client = os.secret_v1.SecretClient(service='key-manager')
+        cls.consumer_client = os.secret_v1.ConsumerClient()
+        cls.container_client = os.secret_v1.ContainerClient()
+        cls.order_client = os.secret_v1.OrderClient()
+        cls.secret_client = os.secret_v1.SecretClient()
         cls.secret_consumer_client = os.secret_v1_1.SecretConsumerClient()
-        cls.secret_metadata_client = os.secret_v1.SecretMetadataClient(
-            service='key-manager'
-        )
+        cls.secret_metadata_client = os.secret_v1.SecretMetadataClient()
         cls.version_client = os.secret_v1_1.VersionClient()
 
         os = getattr(cls, 'os_roles_%s' % cls.credentials[1][0])
-        cls.quota_client = os.secret_v1.QuotaClient(service='key-manager')
+        cls.quota_client = os.secret_v1.QuotaClient()
 
     @classmethod
     def setup_credentials(cls):