Add RHSM port to output

[lewisdenny]

resolves #263

[lewisdenny]

Example output:

OS
  Hostname: labatron5000.lab.com
  Distro:   [redhat-release] Red Hat Enterprise Linux Server release 7.9 (Maipo)
            [os-release] Red Hat Enterprise Linux Server 7.9 (Maipo) 7.9 (Maipo)
  RHN:      (missing)
  RHSM:     hostname = satellite.lab.com
            port = 8443                                    <----------------------------
            proxy_hostname =

[lewisdenny]

@superjamie Hey mate, could you please take a look at this patch.

[superjamie]

Will do, I'm hoping to spend some time on xsos this week or next