install-script,rhel: Add support for RHSM
Since there's RHSM integration with Anaconda installer, let's take advantage of that.
The usage of "reg-login" as "organization-id" and "reg-product-key" as "activation-key" is a little bit of a stretch, but still looks better than trying to add specific RHSM configuration options.
Signed-off-by: Fabiano Fidêncio fidencio@redhat.com