[horde] Problem in Horde password changing on Kolab 2.1 multidomain

[Fabio Pietrosanti]

Changing passwords trough Horde passwd module of multidomain of a kolab
installation (kolab 2.1) doesn't work.

Sometimes the passwd module say:
 Failure in changing password on Local Kolab Server: User not found.

Sometimes say:
 Failure in changing password on Local Kolab Server: Wrong Password

Have tried with several different configuration and found that on
"primary domain" (the one specified in kolab maildomain in conf.php of
horde) password changing works fine, but on additional domains it
doesn't work.

Fabio