[cvp-spt] Allow to redefine flavor parameters from environment variables

Additional changes: 
* remake calling 'image_name' variable for more pythonic way
* subprocess.call calls with shell=True when creating the image
* fix the deprecation message from yaml.load


Change-Id: Ic057f7b0364eed2ab0693569b1330e8066def757
Related-Prod:#PROD-26971(PROD:26971)
5 files changed
tree: 447f8235b0ae974a05105ffe16eee25feebd0a02
  1. bin/
  2. docs/
  3. test_set/
  4. .gitignore
  5. Dockerfile
  6. LICENSE