packaging: setup: rewrite

missing is checking the MinimalETLVersion during setup, it is not really
required as setup is merged now, and it is easy to add this in future if
required.

read-only user creation is removed, it is not part of setup, we can
provide a script to do so.

Change-Id: Ic3cceaac390d5d373d2d1f5e46171305ae590b51
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>