Host flag

[jmorganca]

Currently if a user uses Infra with two Kubeconfigs – each with a respective registry, they'll have incorrect login prompts when logging in via Infra. We should support a global --registry flag to all commands to force commands which target registry to use.

That way a kubeconfig for a specific registry can fetch tokens via infra tokens create <destination> --registry infra.example.com

[mxyng]

I was hoping to add this as part of the configuration changes. There's a few persistent flags we should add to the command line, e.g. -v, -r registry