[cwctl] rewrite wsgi method choices
This will help devs to add new choices by adding their callback to WSGI_CHOICES.
Note:
``options`` becomes a property because ``wsgichoices()`` should be
evaluated at the last-minute.
sync_schema_props_perms('EmailAddress')
for source in rql('CWSource X WHERE X type "ldapuser"').entities():
config = source.dictconfig
host = config.pop('host', u'ldap')
protocol = config.pop('protocol', u'ldap')
source.cw_set(url=u'%s://%s' % (protocol, host))
source.update_config(skip_unknown=True, **config)
commit()