sshpeer: also use doublepipe for client to server communication

This will allow even more real time output when the server issue output in the
middle a stream push.

mercurial/sshpeer.py

@@ -168,6 +168,7 b' class sshpeer(wireproto.wirepeer):'
 
         self.pipei = util.bufferedinputpipe(self.pipei)
         self.pipei = doublepipe(self.ui, self.pipei, self.pipee)
+        self.pipeo = doublepipe(self.ui, self.pipeo, self.pipee)
 
         # skip any noise generated by remote shell
         self._callstream("hello")