Use tempest's ServiceClients rather than Manager

tempest.Manager has been deprecated for more than 4 years already
and will be removed by [1].
Tempest plugins are expected to consume
tempest.lib.services.clients.ServiceClients directly.

[1] https://review.opendev.org/c/openstack/tempest/+/767628

Change-Id: I72b6984e9da724339702cddfa62e140593196508

mogan/tests/tempest/service/client.py

@@ -14,12 +14,13 @@
 #    under the License.
 
 from oslo_serialization import jsonutils as json
+from tempest import clients as tempest_clients
 from tempest import config
 from tempest.lib.common import rest_client
+from tempest.lib.services import clients
 from tempest.lib.services.image.v2 import images_client as image_cli
 from tempest.lib.services.network import floating_ips_client as fip_cli
 from tempest.lib.services.network import networks_client as network_cli
-from tempest import manager
 
 CONF = config.CONF
 
@@ -353,7 +354,7 @@ class BaremetalNodeClient(rest_client.RestClient):
         self.update_bm_node(node_id, updates)
 
 
-class Manager(manager.Manager):
+class Manager(clients.ServiceClients):
 
     load_clients = [
         'baremetal_compute_client',
@@ -403,7 +404,15 @@ class Manager(manager.Manager):
     baremetal_node_params.update(default_params)
 
     def __init__(self, credentials=None, service=None):
-        super(Manager, self).__init__(credentials)
+        dscv = CONF.identity.disable_ssl_certificate_validation
+        _, uri = tempest_clients.get_auth_provider_class(credentials)
+        super(Manager, self).__init__(
+            credentials=credentials,
+            identity_uri=uri,
+            scope='project',
+            disable_ssl_certificate_validation=dscv,
+            ca_certs=CONF.identity.ca_certificates_file,
+            trace_requests=CONF.debug.trace_requests)
         for client in self.load_clients:
             getattr(self, 'set_%s' % client)()