py3: add b'' to config options in test extension

# skip-blame because just b'' prefixes

Differential Revision: https://phab.mercurial-scm.org/D2272

tests/sshprotoext.py

@@ -22,8 +22,8 from mercurial import (
 configtable = {}
 configitem = registrar.configitem(configtable)
 
-configitem('sshpeer', 'mode', default=None)
-configitem('sshpeer', 'handshake-mode', default=None)
+configitem(b'sshpeer', b'mode', default=None)
+configitem(b'sshpeer', b'handshake-mode', default=None)
 
 class bannerserver(wireprotoserver.sshserver):
     """Server that sends a banner to stdout."""