Handle host-specific ssl certificates

install/apps/metronome-init

install/sql/incremental/upd_0081.sql

install/sql/ispconfig3.sql

interface/web/mail/form/xmpp_domain.tform.php

interface/web/mail/lib/lang/en_xmpp_domain.lng

interface/web/mail/templates/xmpp_domain_edit_ssl.htm

interface/web/mail/xmpp_domain_edit.php

server/conf/metronome_conf_host.master

server/conf/metronome_conf_ssl.master

server/mods-available/xmpp_module.inc.php

server/plugins-available/xmpp_plugin.inc.php