Add SIGQUIT to the fatal signals list
Add SIGQUIT to the fatal signals list

Summary: Some infrastructure sends `SIGQUIT` to stuck processes and we would like to be able to log stacktraces for these.

Reviewed By: yfeldblum

Differential Revision: D7819980

fbshipit-source-id: d99a1232ca259bd95aed82505751e6591af748ff

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly