Description of problem: Add feature in "katello-certs-check" to check for an unsupported character in the hostname Version-Release number of selected component (if applicable): satellite-6.9. How reproducible: Steps to Reproduce: 1. add the hostname with an underscore for capsule or satellite 2. Installer will fail 3. Actual results: `# capsule-certs-generate [...] --foreman-proxy-cname "sat_cap3.lb.example.com"` `Parameter foreman-proxy-cname invalid: Elements of the array are invalid: sat_cap3.lb.example.com must match one of (?-mix:\A(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])\z) during configuration, exiting` Expected results: If we can check the SSL certs or the SAN has such hostname, we can warn customers that those hostnames are not supported. Additional info:
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