* move set_module_args to units.modules.utils
* unit tests: reuse set_module_args
* unit tests: mock exit/fail_json in module.utils.ModuleTestCase
* unit tests: use module.utils.ModuleTestCase
* unit tests: fix 'import shadowed by loop variable'
- 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