Docker pull from private v2 registry fails with image not found

Issue

• Docker pull is not working, even though image exists in registry

  # docker pull registry.example.com:5000/myrhel7
  Using default tag: latest
  Trying to pull repository registry.example.com:5000/myrhel7 ... not found
  Error: image myrhel7:latest not found
  

• docker pull fails with image not found, and docker daemon debug logs show the following error:

  level=debug msg="Error trying v2 registry: Get 
  http://registry.example.com:5000/v2/myrhel7/manifests/latest: no basic 
  auth credentials"
  

• Using oreg_url in hosts doesn't work if private registry requires authentication