frappy_psi.sea: use secnode.name to determine the service

this fix is only needed in case uri is not given

frappy_psi/sea.py

@@ -126,8 +126,7 @@ class SeaClient(ProxyClient, Module):
     _last_connect = 0
 
     def __init__(self, name, log, opts, srv):
-        nodename = srv.node_cfg.get('name') or srv.node_cfg.get('equipment_id')
-        instance = nodename.rsplit('_', 1)[0]
+        instance = srv.secnode.name.rsplit('_', 1)[0]
         if 'uri' not in opts:
             self._instance = instance
             port = get_sea_port(instance)