Summary:
If openssl is not available, this would lead to an unhandled rejection exception. That is because a lot initialization logic generates promises that don't get a catch chained on immediately. Changed the flipper server startup flow to be more idiomatically async
Fixes https://github.com/facebook/flipper/issues/2766
Changelog: More clearly communicate if flipper server failed to start (e.d. due to port already taken, openssl not being available)
This change fixes it only for desktop flipper, will make sure the browser UI will support this as well (the error will fire correctly there, but there are no listeners during startup)
Reviewed By: nikoant
Differential Revision: D33348923
fbshipit-source-id: f561bb27b18a3041c514b37f7aed11435a49647f
8259f92983