Extends `module_defaults` by adding a prefix to defaults `group/` which denotes a builtin list of modules. Initial groups are: `group/aws`, `group/azure`, and `group/gcp`
* Move profile and region checking to module_utils.ec2
Remove ProfileNotFound checking from individual modules
There are plenty of `if not region:` checks that could be removed,
once more thorough testing of this change has occured
The ec2_asg, iam_managed_policy and ec2_vpc_subnet_facts modules
would also benefit from this change but as they do not have tests
and are marked stableinterface, they do not get this change.
Ryan Brown
Will Thames
Toshio Kuratomi
hyperized