Add an option to disable the greenlet tracer
Add an option to disable the greenlet tracer

Summary: The greenlet tracer is annoying when using pdb because it prints a warning every 30 seconds. This diff adds a switch to disable it. It's still on by default, though.

Test Plan: Tested manually.

Reviewers: emfree

Reviewed By: emfree

Projects: #sync-engine

Differential Revision: https://phab.nylas.com/D1681

ErinCall/sync-engine,nylas/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,Eagles2F/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,gale320/sync-engine,nylas/sync-engine,closeio/nylas,ErinCall/sync-engine,closeio/nylas,ErinCall/sync-engine,nylas/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,jobscore/sync-engine,gale320/sync-engine,nylas/sync-engine,closeio/nylas,jobscore/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,ErinCall/sync-engine,closeio/nylas,Eagles2F/sync-engine,gale320/sync-engine,gale320/sync-engine,Eagles2F/sync-engine,jobscore/sync-engine