Merge branch 'stable-2.14'

* stable-2.14:
  Remove duplicated test dependencies declaration
  Simplify the way to retrieve project.py script from bazlets
  Use project.py from bazlets
  Document a simpler syntax to execute the tests in standalone mode
  Remove duplicated external dependencies definitions

Change-Id: I68b6a6525df4fb080f3a69f397a461a97943d80d