priority_auth_renewer: only try to republish if failed to do so
priority_auth_renewer: only try to republish if failed to do so

There is no longer a race condition here, so while it is good to
retry, it is not any longer because of the client requesting the
combination before it actually subscribed to the response channel.

Now we just keep retrying for a while if publishing the results
fail.

3scale/xcflushd,3scale/xcflushd