Add a log msg "closing troubled socket <address>" when we receive an

'x' event for a wrapper and then close it.

src/ZEO/zrpc/client.py

@@ -335,6 +335,7 @@ class ConnectThread(threading.Thread):
                 continue
             # Exceptable wrappers are in trouble; close these suckers
             for wrap in x:
+                log("CT: closing troubled socket %s" % str(wrap.addr))
                 del wrappers[wrap]
                 wrap.close()
             # Writable sockets are connected