Fixed a bug that could cause invalidations for clients of storage

servers that serve ZEO clients (use ZEO clients as their storages) to
be delayed.

src/ZEO/StorageServer.py

@@ -1066,6 +1066,7 @@ class StorageServer:
         for p in connections:
             try:
                 p.connection.should_close()
+                p.connection.trigger.pull_trigger()
             except ZEO.zrpc.error.DisconnectedError:
                 pass
         

src/ZEO/tests/registerDB.test

@@ -61,6 +61,14 @@ stub that implements the client invalidation calls:
     ...         self.mgr.close_conn(self)
     ...     def poll(self):
     ...         pass
+    ...
+    ...     @property
+    ...     def trigger(self):
+    ...         return self
+    ...
+    ...     def pull_trigger(self):
+    ...         pass
+
 
     >>> class ZEOStorage:
     ...     def __init__(self, server, name):