soas05xo needs to respecify repository for olpc-platform-specific rpms

Booted XO1 from USB stick created from soas05xo.iso. Tried to run yum upgrade - it failed because /etc/yum.repos.d/olpc.repo in soas05xo points to a no longer existing repository.

Since SoaS is now F12-based, either: 1) The release notes for SoaS need to explain that it is alright to "upgrade" soas builds for the XO with F11-based olpc-specific rpms; or 2) A repository of F12-based olpc-specific rpms needs to be provided. In either case, /etc/yum.repos.d/olpc.repo in soas05xo (and follow-on builds) needs to be corrected.