Understand how fancy-profiles works with named servers

[yuvipanda]

Named servers save some state about the started server. What happens if we stop and start the named server, but using fancy profiles? What happens using regular profiles?

[yuvipanda]

Currently, you can use various options to start (and that works), but then as soon as they stop, they are 'forgotten'. I had kinda assumed that the options_form code in jupyterhub would somehow 'save' that in state and restore, but I think it does not. Needs investigation to primarily answer the following questions:

1. When options from profile form are posted, are they saved anywhere?
2. If they are saved, are they restored somewhere?