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Description of problem:

With the deprecation of support for self-registered Satellites in Satellite 6.3 (see https://access.redhat.com/documentation/en-us/red_hat_satellite/6.3-beta/html-single/installation_guide/#system_requirements), I would like to request that foreman_admin doesn't allow end-users to upgrade systems that are self-registered. 

Currently today we warn them (https://github.com/theforeman/foreman_maintain/blob/master/definitions/checks/system_registration.rb).

*** This bug has been marked as a duplicate of bug 1544769 ***