pbs: ssh shouldn't blindly connect to host

slapos/recipe/pbs.py

@@ -258,9 +258,7 @@ class Recipe(GenericSlapRecipe, Notify, Callback):
     # Create the rdiff-backup wrapper
     # It is useful to separate it from the notifier so that we can run it manually.
 
-    # XXX use -y because the host might not yet be in the
-    #     trusted hosts file until the next time slapgrid is run.
-    remote_schema = '{ssh} -y -o "ConnectTimeout 300" -p %s {username}@{hostname}'.format(
+    remote_schema = '{ssh} -o "ConnectTimeout 300" -p %s {username}@{hostname}'.format(
               ssh=self.options['sshclient-binary'],
               username=parsed_url.username,
               hostname=parsed_url.hostname