Description of problem:
Provisioning vs non-provisioning modes should be made explicit in the overview section for Foreman.  The customer should be given the system prereqs.


Additional Info:
> > 3) What is the expectation for where the actual RPMs come from?  Are
> > customers expected to initially provision systems via Satellite and then
> > Foreman helps install the rest of the content?  RHN?

From Mike Orazi:
> There are really 2 modes you can set up Foreman to use:
>   - Provisioning mode is where foreman will pxe boot machines from
> scratch and apply all the puppet magic to realize the machine as a
> member of the correct host group.  This can consume content from either
> RHN or Satellite
> 
>   - Non-provisioning mode where the end user is expected to provision
> the machine and register it back to the correct host group in Foreman
> and then applies all the correct puppet magic to the existing machine.
> Non-provisioning mode likewise can pull content from either RHN or
> Satellite depending on how the machine is initially provisioned.
> 
> NOTE:  Non-provisioning mode is easier to develop and debug against so
> we typically run through those scenarios a lot more frequently than
> provisioning mode