ticket 1705 - internationalize help topics

* Wrap each topic description in _()

* Replace the use of if 'topic' in dir(module) with the more
  Pythonic and efficient getattr(module, 'topic', None)

* Make sure to invoke unicode on the value returned from _()
  otherwise you'll get a GettextFactory instance, not a string

* Clean up trailing whitespace errors

ipalib/plugins/sudorule.py

@@ -47,7 +47,7 @@ from ipalib import Str, StrEnum
 from ipalib.plugins.baseldap import *
 from ipalib import _, ngettext
 
-topic = ('sudo', 'Commands for controlling sudo configuration')
+topic = ('sudo', _('Commands for controlling sudo configuration'))
 
 def deprecated(attribute):
     raise errors.ValidationError(name=attribute, error=_('this option has been deprecated.'))