Lambda to run that will force AWS users to rotate their IAM access keys.
Refer to this post for more details: http://www.nitedesign.com/improve-your-sec…on-for-iam-users/
expirationPeriodDays: The number of days of which a key shouuld be expired. The notification process will begin notifying 7 days prior.
emailSender: The SES email to use to send the email
emailSenderARN: The SES ARN to use to send the email
emailDomain: Email domain to send emails to, this will be appended to the IAM User name include the '@' symbol: AWSUserName@example.com would require '@example.com'
IAMGroup: AWS IAM group to query users to rotate their keys