* Add tests for group in a VPC
* Improve ec2_group output and documentation
Update ec2_group to provide full security group information
Add RETURN documentation to match
* Fix ec2_group creation within a VPC
Ensure VPC ID gets passed when creating security group
* Add test for auto creating SG
* Fix ec2_group auto group creation
* Add backoff to describe_security_groups
Getting LimitExceeded from describe_security_groups is definitely
possible (source: me) so add backoff to increase likelihood of
success.
To ensure that all `describe_security_group` calls are backed off,
remove implicit ones that use `ec2.SecurityGroup`. From there,
the decision to remove the `ec2` boto3 resource and rely on the client
alone makes good sense.
* Tidy up auto created security group
Add resource_prefix to auto created security group and delete
it in the `always` section.
Use YAML argument form for all module parameters