fix notifications.py

fix ops.tasks.check_server_performance_period AttributeError: type object 'Status' has no attribute 'get_terminal_latest_stat'

apps/ops/notifications.py

@@ -6,7 +6,8 @@ from notifications.notifications import SystemMessage
 from notifications.models import SystemMsgSubscription
 from users.models import User
 from notifications.backends import BACKEND
-from terminal.models import Status, Terminal
+from terminal.models.component.status import Status
+from terminal.models import Terminal
 
 __all__ = ('ServerPerformanceMessage', 'ServerPerformanceCheckUtil')