Refactor urlparse_ into _urlparse which is more pythonic.

setup.py

@@ -90,7 +90,7 @@ setup(name=name,
           'sshkeys_authority.request = slapos.recipe.sshkeys_authority:Request',
           'stunnel = slapos.recipe.stunnel:Recipe',
           'testnode = slapos.recipe.testnode:Recipe',
-          'urlparse = slapos.recipe.urlparse_:Recipe',
+          'urlparse = slapos.recipe._urlparse:Recipe',
           'vifib = slapos.recipe.vifib:Recipe',
           'xwiki = slapos.recipe.xwiki:Recipe',
           'zabbixagent = slapos.recipe.zabbixagent:Recipe',