wireproto: handle other server output in pushkey

Remote side may add useful information alongside failure return code. For
example "ssl is required". This patch mirror what is done for the unbundle
command.

mercurial/wireproto.py

@@ -239,11 +239,14 b' class wirerepository(repo.repository):'
                      old=encoding.fromlocal(old),
                      new=encoding.fromlocal(new)), f
         d = f.value
+        d, output = d.split('\n', 1)
         try:
             d = bool(int(d))
         except ValueError:
             raise error.ResponseError(
                 _('push failed (unexpected response):'), d)
+        for l in output.splitlines(True):
+            self.ui.status(_('remote: '), l)
         yield d
 
     @batchable