TL;DR: update PostfixAdmin from 3.2 to 3.2.4

Long version:

- Add Recommends for postfixadmin-apache

- Split out a postfixadmin-apache package
- Update to version 3.2.4
* Upgrade Smarty (v3.1.35)
* Fix issues with quota (cli mailbox creation)
* Improve database compatability (row->r).
* Persistent MySQLi connections: Missing SSL at reconnect
* Fix SQLite paging issues, see #161 and #87
* Fix postfixadmin-cli, see #296

- "downgrade" php-imap to Recommends because latest PHP packages no longer
include it. (Without php-imap auto-creating folders when creating a mailbox
won't work.)

- bsc#1130588: Require shadow instead of old pwdutils

- fix deps
* add missing php-imap (setup is checking for it)
* add missing php-phar
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