slapos.recipe.pbs: Ignore numerical IDs (UID/GID) when push

With new rdiff-backup version, it is possible to speed up push process by ignoring UID/GID changes (as it will always be different because of different partitions)

/reviewed-on nexedi/slapos!378

slapos/recipe/pbs.py

@@ -74,6 +74,7 @@ class Recipe(GenericSlapRecipe, Notify, Callback):
         $RDIFF_BACKUP \\
                 --remote-schema %(remote_schema)s \\
                 --restore-as-of now \\
+                --ignore-numerical-ids \\
                 --force \\
                 %(local_dir)s \\
                 %(remote_dir)s