This ticket is to track implementation of login stacks.
Login stacks would allow multiple login stacks to be defined, and users get a selection on first entering /login/.
A login stack can contain various "intermediate" plugins, and one "final" plugin.
Intermediate would be for example gssapi/auth_kerb, where auth is performed automatically, invisible to the user.
A final plugin would be a module with a form.
Also, a login stack can contain up to 1 info plugin.
Metadata Update from @puiterwijk:
- Issue set to the milestone: Backlog
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