add TenantRoot models to model __init__.py
diff --git a/xos/core/models/__init__.py b/xos/core/models/__init__.py
index b13e449..0fafb8e 100644
--- a/xos/core/models/__init__.py
+++ b/xos/core/models/__init__.py
@@ -1,7 +1,7 @@
 from .plcorebase import PlCoreBase,PlCoreBaseManager,PlCoreBaseDeletionManager,PlModelMixIn
 from .project import Project
 from .singletonmodel import SingletonModel
-from .service import Service, Tenant, CoarseTenant, ServicePrivilege
+from .service import Service, Tenant, CoarseTenant, ServicePrivilege, TenantRoot, TenantRootPrivilege, TenantRootRole
 from .service import ServiceAttribute
 from .tag import Tag
 from .role import Role