option not to start portal on failed autoconnect

[liebman]

Enhancement request.

It would be nice to be able to only start the portal on demand but still use the auto connect logic. My use case is a battery powered clock and I want to avoid having the portal pop up if no one is around to configure it. So if auto connect fails I'll just go back to sleep. If a button is held during reset then I'll open the portal. Thoughts?

I may throw out a pull request...

[tablatronix]

I was about to add this to development