Fix a few ResourceWarnings in idle

Lib/idlelib/configHandler.py

@@ -145,6 +145,7 @@ class IdleUserConfParser(IdleConfParser):
             except IOError:
                 os.unlink(fname)
                 cfgFile = open(fname, 'w')
+            with cfgFile:
                 self.write(cfgFile)
         else:
             self.RemoveFile()

Lib/idlelib/rpc.py

@@ -534,6 +534,10 @@ class RPCClient(SocketIO):
     def get_remote_proxy(self, oid):
         return RPCProxy(self, oid)
 
+    def close(self):
+        self.listening_sock.close()
+        SocketIO.close(self)
+
 class RPCProxy(object):
 
     __methods = None