default: remove processing of unused options

These options were used by a subclass that does not exist anymore.

slapos/recipe/build/__init__.py

@@ -268,8 +268,6 @@ class Script(EnvironMixin):
     except KeyError:
       self.options['location'] = os.path.join(
         buildout['buildout']['parts-directory'], self.name)
-    for k in 'url', 'md5sum', 'path':
-      self.options[k] = self.options.get(k, '').strip()
     self.script = self.options['script']
     if self.script:
       if self.options.get('format', 'yes') in TRUE_LIST: