dcs-rs-deploy: use http.debian.net instead of the rackspace mirror
dcs-rs-deploy: use http.debian.net instead of the rackspace mirror

The latter is sometimes out of date or just down.

lamby/dcs,jamessan/dcs,lamby/dcs,jamessan/dcs,jamessan/dcs,jamessan/dcs,lamby/dcs,lamby/dcs