class AWS::IAM::User

* deleting its signing certificates
* deleting its mfa devices
* deleting all of its access keys
* removing it from all groups
* deleting its login profile
Deletes the current user, after:

def delete!
  groups.clear
  access_keys.clear
  policies.clear
  mfa_devices.clear
  signing_certificates.clear
  login_profile.delete if login_profile.exists?
  delete
end