Remove docker login from Travis build (#965)
Remove docker login from Travis build (#965)

The bondciimages.azurecr.io has been configured for anonymous read-only
access, so the `docker login` step is no longer needed.
chwarr/bond,chwarr/bond,Microsoft/bond,chwarr/bond,Microsoft/bond,Microsoft/bond,Microsoft/bond,Microsoft/bond,chwarr/bond,Microsoft/bond,chwarr/bond,chwarr/bond