[horde] Force cram-md5 authentication.

[Michael C. Robinson]

The following backends.local.php doesn't do the job.

<?php
$servers['secure-imap'] = array
(
    'disabled' => false,
    'name' => 'robinson-west.com',
    'hostspec' => 'mail.robinson-west.com',
    'hordeauth' => full,
    'protocol' => 'imap',
    'port' => 993,
    'secure' => 'tls',
    'maildomain' => 'robinson-west.com',
    'acl' => true,
    'cache' => false,
);
?>

Question, is there a way to move the cram-md5 password file to
a mariadb database?  Can dovecot authenticate to a database?
Should secure => 'tls' be secure => 'ssl'???