Change the to_scan module process

[jmons]

This is an issue where new modules need to be added - but does it make sense to actually require this setting, i.e. shouldn't it be based on what modules there are in the discovery mode? And then allow (in future) config to --exclude particular modules (or white list), but by default use all available modules?

[jmons]

Also, discussion in team is to also change the region mode for AWS, so that the 'framework' will have a change to Resource, and that the AWSResource will do the region loop. AWSResources should also be able to implement a regionless flag of some kind, so that they are called once (e.g. dynamo / s3) to optimise speed.

[jmons]

Completed as part of #30