zun image-search failed

[chengyang]

In commit:https://review.openstack.org/#/c/522104/
We add parameter 'host' to function image_search in rpcapi.py and
pass it when image_search during container_create, but forget to modify
 function image_search in compute/api.py：

    def image_search(self, context, image, image_driver, *args):
        return self.rpcapi.image_search(context, image, image_driver, *args)

missing host parameter

[Madhuri Kumari (madhuri-rai07)]

Thank you Chengyang, the bug is fixed now by https://review.openstack.org/#/c/529260/