Establish security infrastructure in Thunderbird AWS account

[gene1wood]

@Sancus Here's that request we'd chatted about

In order for the Mozilla Security Assurance team to be able to both audit the security of your account and respond in the case of a security incident where you can't be reached, these AWS IAM Roles should be installed

Here are instructions on installing them : https://mana.mozilla.org/wiki/display/SECURITY/AWS+Security+Auditing+and+Incident+Response+Services

This additionally installs a role that enables us to wire up GuardDuty events into the Mozilla Security Information and Event management system.