DS usage scripts - remote log fetching

Hi,

I've been working on a solution for remotely fetching logs from a DS (either a Tuakiri/Shibboleth project or a SWITCH/AAF implementation) and pushing them into the FR wayf_access_record database.

Some minor enhancements to scripts that have already been contributed (adding --dry-run options) plus a script that drives the remote fetching from multiple sources.

Happy to contribute this.

Cheers,
Vlad