functions: Avoid confusing message

We had the following message :
Copying tree /var/lib/debootstrap/install/D7-H.1.0.0/base/ to /var/lib/debootstrap/install/D7-H.1.0.0/deploy/done

This give the feeling that we rsync into a "done" directory which is
wrong since it's only the "done" message once the rsync is over.

Adding a colon will help in making the read easier.
build: Renaming Satellite to RHN

We are not using Satellite but RHN. Let's rename everything accordingly.

SATELLITE_USER & SATELLITE_PASSWORD become RHN_USER and RHN_PASSWORD
too.