* Add test for unexpected egress rule in default VPC
When passing rules_egress to ec2_group, the default
egress rule shouldn't be created (if `purge_rules_egress`)
is set. Test this.
* Respect egress rule defintions for default VPC groups
When passing rules_egress and purge_rules_egress, the
default egress rule should not be created
Fixes#34429
* Change AWS credential passing to be YAML anchors
Vastly simplify the AWS tasks by reducing the credentials to a YAML
block
39af276639