* Added feature health_check_grace_period_seconds to ecs_service, this time with a botocore version check and some initial testing
* Only set health_check_grace_period_seconds when loadbalancers are defined
* Removed leftover commas and fix in test
* Removed blank line
* Minor improvements for ecs_service module
* Removed default (30) for health_check_grace_period_seconds param
* Changed botocore version allowed to 1.8.20 for health check param.
* Fix empty healthcheck failure