Training: Change RHN to Customer Portal

[bocekm]

SUMMARY

RHN has been decomissioned and the term is not being used anymore. The term used now is Red Hat Subscription Management (RHSM) which one can use to register a system to Red Hat Customer Portal (or Red Hat Satellite).

See Red Hat Subscription Management Migration FAQ for more info.

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

AgnosticD training adoc files.

[bocekm]

@amayagil, you might want to take a look.