Scientific Linux Security Update : GPG-RPM key on SL3.x, SL4.x, SL5.x i386/x86_64

Updating the GPG keys in the release to include a Scientific Linux RPM signing key to sign the rpm's with. We will start using this new key, and stop using Connie or Troy's personal GPG Keys for signing rpm's. This is labeled as Moderate because those machines that have gpg checking turned on wil...