Validate bundle key by entity keys' bundle, not bundle keys' bundle.

The patch in #1506190: Don't allow to create Entities without Bundles and commit http://drupalcode.org/project/restws.git/commit/2318d17 is incorrect.

The property that refers to the bundle is in entity keys, not bundle keys (api). Bundle keys refers to the property on the bundle itself, which may or may not match the entity key bundle. This will fail for entities like Organic group membership and membership type IIRC (i.e. $entity->type == $entity_type->name).

I don't have time to make a patch at the moment, but as an example. I'll try to roll a patch some time.

    $entity_info = entity_get_info($this->entityType);
    if (isset($entity_info['entity keys']['bundle'])) {
        if (!array_key_exists($entity_info['entity keys']['bundle'], $values)) {
          throw new RestWSException('Missing bundle: ' . $entity_info['entity keys']['bundle'], 406);
        }   
    }