Pulling from a private registry

In the migration docs we have this snippet below

Support for Global Registry credentials moved to an external plugin

Any idea what this plugin is called ? or how else I can specify the username and password to pull from a private repository ?

I could not see a plugin that sounded like it would do the job below

or how else I can specify the username and password to pull from a private repository ?

http://discuss.harness.io/t/how-to-pull-private-images-with-1-0/3155