Make it possible to use health_status, exec_start and exec_create as is in event filter. This way, using `health_status` as filter will allow to get all health_status events (healthy, unhealthy, …) instead of having to us all combination (`health_status: healthy`, `health_status: unhealthy`, …). Same goes for `exec_start` and `exec_create`. Signed-off-by: Vincent Demeester <vincent@sbr.pm> Upstream-commit: 71d8313ad415b8ec6efff3e88f48b5465f30c9a9 Component: engine