Unable to install katello-agent on RHEL 8 system registered to Red hat Satellite 6.

Issue

• RHEL 8 hosts fail to install katello-agent, and the following error messages are generated:

    Problem: package katello-agent-3.5.0-2.el8sat.noarch requires python3-gofer-proton, but none of the providers can be installed
    package python3-gofer-proton-2.12.5-3.el8sat.noarch requires python3-qpid-proton >= 0.9-5, but none of the providers can be   installed
    conflicting requests
    nothing provides python3 needed by python3-qpid-proton-0.26.0-3.el8.x86_64 
    (try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)