[horde] Have to authenticate twice

[Cristian Livadaru]

Quoting Thiago Vinhas de Moraes <thiago.vinhas at gmail.com>:

> Why do I have to authenticate twice on my Horde/IMP system? First I
> have to authenticate to Horde, then I have to give the same
> information to authenticate to IMP. I´m using the IMAP authentication.
>

first read the REAME files, then change the authentication so that IMP 
does the
authentication ( exactly this case is mentioned in the readme files )