mediawiki: Update to 1.20.5
zabbix: Don't set the mbstring.func_overload option

This breaks MediaWiki running in the same web server.  Zabbix no
longer seems to need it anyway.
bacula: file daemon needs to run as root
bacula: add ExecReload
systemd.sockets: Add listenStreams option for specifying several sockets
no ipv4ll at work
try to fix zfs into initrd