Goferd connection errors in messages log of content host registered to Red Hat Satellite 6

Issue

• On a Content Host registered to Red Hat Satellite 6 or a Capsule, one can see disconnect errors in /var/log/messages logs:

  Aug 27 13:07:32 test goferd: [INFO][worker-0] root:525 - Disconnected
  Aug 27 13:07:32 test goferd: [ERROR][worker-0] gofer.messaging.adapter.proton.connection:106 - connect: proton+amqps://satellite.example.com:5647, failed: Connection amqps://satellite.example.com:5647 disconnected
  Aug 27 13:07:32 test goferd: [INFO][worker-0] gofer.messaging.adapter.proton.connection:108 - retry in 106 seconds
  Aug 27 13:09:19 test goferd: [INFO][worker-0] gofer.messaging.adapter.proton.connection:100 - connecting: URL: amqps://satellite.example.com:5647|SSL: ca: /etc/rhsm/ca/katello-default-ca.pem|key: None|certificate: /etc/pki/consumer/bundle.pem|host-validation: None
  Aug 27 13:09:19 test goferd: [INFO][worker-0] root:485 - connecting to satellite.example.com:5647...
  Aug 27 13:10:22 test goferd: [INFO][worker-0] root:525 - Disconnected
  

• Content hosts registered to Red Hat Satellite 6 show Connection refused error in var/log/messages

  goferd: [ERROR][pulp.agent.b7bd4b40-dbc2-4de1-8503-f37a7ef16768] gofer.messaging.adapter.connect:33 - connect: proton+amqps://satellite.example.com:5647, failed: Connection amqps://satellite.example.com:5647 disconnected: Condition('proton.pythonio', 'Connection refused to all addresses')