Bootstrap full setup with light setup

[kilrau]

Is your feature request related to a problem? Please describe.
Full setup takes ages to sync

Describe the solution you'd like
By default bring up light setup first and switch over to full setup once it's synced an ready

Describe alternatives you've considered
We could continue tweaking the full setup sync performance, but this will lead to a best case several hours syncing time (on really powerful machines). It will never be "great" UX.

Additional context

• Status command would need to give the market maker a sync indicator of the full setup while showing sync status and when light setup is ready
• LND's / connext would have to be restarted in order to switch to full nodes. I guess we can't avoid a user prompt to confirm that

[kilrau]

Would appreciate your thoughts @erkarl @sangaman @reliveyy @michael1011

[michael1011]

Sounds good and really reasonable

[reliveyy]

+1. It will make test cases easier. And I don't need to create the light config file before running xud script.

[kilrau]

We can only do this once the light setup doesn't require a special config anymore (#366), moved to beta.5.