info: Comply with new configuration policy

There are plenty of hardcoded cell names in the info service, but info
service has to be refactored further to parameterize these. This is not
done in this patch.

New properties

info.cell.name
info.cell.export
info.net.port
info.net.listen
info.net.backlog

Target: trunk
Require-notes: yes
Require-book: yes
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/5740/