Added basic IAM data collection for users, groups, roles and virtualmfadevices.
Merge branch 'iam' of github.com:e-gineer/edda into e-gineer-iam
rename:
aws.users => aws.iamUsers
aws.groups => aws.iamGroups
aws.roles => aws.iamRoles
aws.virtualmfadevices => aws.iamVirtualMFADevices