[Dovecot] Patch: support URLAUTH, BURL, CATENATE

[Mike Abbott]

> With v2.0 it's possible to do:
> 
> disable_plaintext_auth = yes
> remote submit.domain.org {
>  disable_plaintext_auth = no
> }
> 
> I think that takes care of the need for X-PLAIN-SUBMIT?

Wouldn't that allow anyone from submit.domain.org to use plaintext, rather than only submit users?  I know X-PLAIN-SUBMIT is not pretty and there should be a better way.  Not sure that's quite it though.

> [urlauth-keys] could probably use lib-dict instead.

That sounds promising.

> Ported: http://hg.dovecot.org/dovecot-2.0-urlauth/

Awesome!  Thanks!