Red Hat Satellite upgrade from 6.3 to 6.4 fails if IPv6 is disabled.

Issue

• Red Hat Satellite upgrade from 6.3 to 6.4 fails if IPv6 is disabled.

• On Red Hat Satellite 6.4, foreman-proxy service fails to start if IPv6 is disabled

  Oct 19 13:14:56 satellite.example.com systemd[1]: Starting Foreman Proxy...
  Oct 19 13:14:57 satellite.example.com  smart-proxy[24755]: Running Foreman Ansible Core in non-SCL context
  Oct 19 13:14:57 satellite.example.com  smart-proxy[24755]: Errors detected on startup, see log for details. Exiting: Address family not supported by protocol - socket(2)
  Oct 19 13:14:57 satellite.example.com  systemd[1]: foreman-proxy.service: main process exited, code=exited, status=1/FAILURE
  Oct 19 13:14:57 satellite.example.com  systemd[1]: Failed to start Foreman Proxy.
  Oct 19 13:14:57 satellite.example.com  systemd[1]: Unit foreman-proxy.service entered failed state.
  Oct 19 13:14:57 satellite.example.com  systemd[1]: foreman-proxy.service failed.
  

• Unable to connect to Red Hat Capsule server port 9090 Red Hat Satellite.

• Getting error messages that proxy at 9090 is not available. Unable to authorize SSL certificates as part of bootstrap.py Red Hat satellite client conversion.