[Secure-testing-team] new package-tags file

[Florian Weimer]

* Steffen Joeris:

> kfreebsd-5 <etch-unsupported> (FreeBSD not yet supported)
> kfreebsd-6 <lenny-unsupported> (FreeBSD not yet supported)
> kfreebsd-7 <lenny-unsupported> (FreeBSD not yet supported)
>
> I thought about using source package name, then the tag and afterwards a small 
> description.

Can we make that

  [etch] kfree-bsd5 <unsupported> (FreeBSD not yet support)

to make it more uniform with the other files?

(In generally, security support should probably be opt-in, not opt-out,
but this effort is a good start.)