pylint: Ignore ngettext builtin

Signed-off-by: Cole Robinson <crobinso@redhat.com>

pylintrc

@@ -29,5 +29,5 @@ dummy-variables-rgx=_+$|(_[a-zA-Z0-9_]*[a-zA-Z0-9]+?$)|dummy|^ignored_|^unused_|
 # This is the standard argument regex, with two 'ignore' variations added
 ignored-argument-names=_.*|^ignored_|^unused_|ignore.*|.*_ignore
 
-# gettext function _() is built in
-additional-builtins=_
+# gettext buitins
+additional-builtins=_,ngettext