@classmethod
def get_host_for_server(cls, server_id):
    server_details = cls.admin_servers_client.show_server(server_id)
    return server_details['server']['OS-EXT-SRV-ATTR:host']
@classmethod
def get_host_for_server(cls, server_id):
    server_details = cls.admin_servers_client.show_server(server_id)
    return server_details['server']['OS-EXT-SRV-ATTR:host']