'Remove a user\'s server from the proxy table.'

@gen.coroutine
def delete_user(self, user, server_name=''):

    routespec = user.proxy_spec
    if server_name:
        routespec = url_path_join(user.proxy_spec, server_name, '/')
    self.log.info('Removing    user    %s    from    proxy    (%s)', user.name, routespec)
    (yield self.delete_route(routespec))
