Summary:
In an attempt to trace Android issues:
1. added more logging to the process (opted for info level for now since this is pretty critical for support requests, yet not super repetitive overall. We could maybe turn it into usage tracking at some point to have central stats?).
2. rewrote promise chains to async/await since they are easier to follow and harder to do accidentally wrong
3. fixed some minor potential problems, will highlights those in code.
Changelog: Improved handling of edge cases in certificate exchange, which should address cases where a Flipper connection wouldn't come up when connection to Android / IOS. Added explicit logging around connection negation.
Reviewed By: lblasa
Differential Revision: D30838947
fbshipit-source-id: a898c6d3be6edc22bd24f9d2bad76e81871360da
d8f77db632