Fix spot instance creation by ignoring instance_initiated_shutdown_behavior (#4741)
Fix spot instance creation by ignoring instance_initiated_shutdown_behavior (#4741)

Before this, all spot instance requests would fail because the code
_always_ called module.fail_json when the parameter was set (which it
always was, because the module parameter's default was set to 'stop').

As the comment said, this parameter doesn't make sense for spot
instances at all, so the error message was also misleading.

thaim/ansible,thaim/ansible