AccessDeniedException InvokeFunction

[rsavjani]

Background

Running latest version of StreamAlert with 1 cluster

Description

When AlertMerger invokes the alert processor it gets IAM access denied based on the policy StreamAlert created.
Its missing the :production tag on the policy. See below:

[ERROR] ClientError: An error occurred (AccessDeniedException) when calling the Invoke operation: User: arn:aws:sts::xxxxxxxxxxx:assumed-role/xxxxx_streamalert_alert_merger_role/xxxxxx_streamalert_alert_merger is not authorized to perform: lambda:InvokeFunction on resource: arn:aws:lambda:eu-west-2:xxxxxxxxx:function:xxxxxx_streamalert_alert_processor:production because no identity-based policy allows the lambda:InvokeFunction action

Steps to Reproduce

Do action that triggers a rule

Desired Change

Code change to fix IAM policy