moved dovecot-lmtpd from install/update to server-plugin to prevented dovecot-errors when using dovecot without dovecot-lmtpd

Fixed missing parts for greylist, rbl in gentoo

- Improved postfix SSL configuration to protect against poodle attack.

Use dovecot or maildrop in default-cases
Switching to LMTP and back included in server-postfix-plugin
validator added to disable switching uid-mapping when already created mailusers or in multiserver-environment

- Added autoinstall for centos, opensuse and gentoo
- Added ini style config autoinstall option
- Autoinstall sample configuration files are now in docs folder
- Removed old autoupdate file