Fix: Disallow multiple connections from client to storage

Keep lock around _initNodeConnection() in connection pool to avoid concurrent
connections to the same storage node.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2134 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/pool.py

@@ -106,15 +106,8 @@ class ConnectionPool(object):
             # must drop some unused connections
             self._dropConnections()
 
-        self.connection_lock_release()
-        try:
         conn = self._initNodeConnection(node)
-        finally:
-            self.connection_lock_acquire()
-
-        if conn is None:
-            return None
-
+        if conn is not None:
             self.connection_dict[node.getUUID()] = conn
         return conn