* Add execution_role_arn parameter
* Change ecs_taskdefinition to use AnsibleAWSmodule
Botocore version checking is becomming more common. Changing the ecs_taskdefinition
to use AnsibleAWSmodule allows more easily for this.
* Change launch type check to use botocore_at_least function
* Remove execution_role_arn param from params dict
* Change check to use parameter
* Fix typo
* Add test for old botocore version
* Add test for execution role parameter
* Remove iam_role_facts task
Task was unecessary. The same information could be gathered by registering
the iam_role task.
b60fc33eef