Fix the way we call find_resource when only using ID

Change-Id: I6fb08edd5499767863e0e67f363bcd9fff3aea60
Closes-Bug: 1475127

Author: Steve Martinelli

openstackclient/identity/common.py

@@ -57,20 +57,32 @@ def find_domain(identity_client, name_or_id):
 
 def find_group(identity_client, name_or_id, domain_name_or_id=None):
     domain_id = _get_domain_id_if_requested(identity_client, domain_name_or_id)
-    return _find_identity_resource(identity_client.groups, name_or_id,
-                                   groups.Group, domain_id=domain_id)
+    if not domain_id:
+        return _find_identity_resource(identity_client.groups, name_or_id,
+                                       groups.Group)
+    else:
+        return _find_identity_resource(identity_client.groups, name_or_id,
+                                       groups.Group, domain_id=domain_id)
 
 
 def find_project(identity_client, name_or_id, domain_name_or_id=None):
     domain_id = _get_domain_id_if_requested(identity_client, domain_name_or_id)
-    return _find_identity_resource(identity_client.projects, name_or_id,
-                                   projects.Project, domain_id=domain_id)
+    if not domain_id:
+        return _find_identity_resource(identity_client.projects, name_or_id,
+                                       projects.Project)
+    else:
+        return _find_identity_resource(identity_client.projects, name_or_id,
+                                       projects.Project, domain_id=domain_id)
 
 
 def find_user(identity_client, name_or_id, domain_name_or_id=None):
     domain_id = _get_domain_id_if_requested(identity_client, domain_name_or_id)
-    return _find_identity_resource(identity_client.users, name_or_id,
-                                   users.User, domain_id=domain_id)
+    if not domain_id:
+        return _find_identity_resource(identity_client.users, name_or_id,
+                                       users.User)
+    else:
+        return _find_identity_resource(identity_client.users, name_or_id,
+                                       users.User, domain_id=domain_id)
 
 
 def _find_identity_resource(identity_client_manager, name_or_id,