Summary:
rename model_helpers to brew. This is a big diff now. I did these things:
1. replace model_helpers with brew:
find . -type f -exec sed -i 's/model_helpers/brew/g' {} +
2. rename model_helpers.py and model_helpers_test.py
3. rename ModelHelpersTest to BrewTest
4. lowercase all the helper functions to distinguish them from single op
5. run my unittests
6. run converge tests
Reviewed By: salexspb
Differential Revision: D4930465
fbshipit-source-id: f420a1b03238df1cbe9f4426e0b9c43a12119661
