wireprotoserver: identify requests via version 2 of SSH protocol as such

The protocol handler needs to advertise itself as version 2 in order
for a future feature to work.

Differential Revision: https://phab.mercurial-scm.org/D2484

mercurial/wireprotoserver.py

@@ -371,6 +371,10 b' class sshv1protocolhandler(wireprototype'
 class sshv2protocolhandler(sshv1protocolhandler):
     """Protocol handler for version 2 of the SSH protocol."""
 
+    @property
+    def name(self):
+        return wireprototypes.SSHV2
+
 def _runsshserver(ui, repo, fin, fout, ev):
     # This function operates like a state machine of sorts. The following
     # states are defined: