Drop the license for pip/cacert.pem

While packaging pip 1.3.1 for Debian, I was surprised to find the CA certificate bundle listed as being licensed under LGPL2.1.

IANAL, but I fail to see how CA certificates (which are essentially factual information combined with large numbers) have any creative content which would be protected by Copyright. I suggest we drop this.

I dug around and saw that other people seem to [agree with this position](http://bugs.debian.org/687693#49).

On the other hand, If we *really do* believe that there is some reason that this license has any effect, then there should be a copyright owner listed as well as a license.