These tests are doing string matches on the error condition. Update
them to match the new strings. This is probably okay to push out to old
releases even though it's technically backwards incompatible because
production playbooks won't be checking that a parameter was missing.
Param missing is something detected and fixed while writing the playbook.
- Fixes to lambda
- reformatting + tests for lambda_facts
- lambda module integration test
- switch lambda and lambda_facts to AnsibleAwsModule
- Get the account ID from STS, GetUser, and finally error message
