This PS implements the following changes:
- switches freeze approach to requirements-direct.txt and
requirements-frozen.txt files
- adjusts code tabulation style according to yapf recommendations
- replaces deprecated usage of responce.body attribute with
responce.text
- fixes integration tests in controlled by Makefile + tox
- uplifts Helm to v3.9.4
Change-Id: I751db72eb8f670825382f11a36657112faeb169a