Fixed a trigger leak, introduced when I removed ThreadedAsync, that

caused an unneeded trigger to be created for each client
connection. This caused tests hang due to running out of file handles.

Let all server connections share a single trigger to avoid using too
many file handles in the server.

src/ZEO/zrpc/connection.py

@@ -382,8 +382,6 @@ class Connection(smac.SizedMessageAsyncConnection, object):
         ourmap = {}
         self.__super_init(sock, addr, map=ourmap)
 
-        self.trigger = trigger()
-
         # The singleton dict is used in synchronous mode when a method
         # needs to call into asyncore to try to force some I/O to occur.
         # The singleton dict is a socket map containing only this object.
@@ -765,11 +763,16 @@ class Connection(smac.SizedMessageAsyncConnection, object):
             self.log("poll()", level=TRACE)
         self._pull_trigger()
 
+
+        
 class ManagedServerConnection(Connection):
     """Server-side Connection subclass."""
     __super_init = Connection.__init__
     __super_close = Connection.close
 
+    # Servers use a shared server trigger that uses the asyncore socket map
+    trigger = trigger()
+
     def __init__(self, sock, addr, obj, mgr):
         self.mgr = mgr
         self.__super_init(sock, addr, obj, 'S')