Zuul checks out the dependant projects by their repo names.
Repo checks out the project directory structure based on the
labels in the manifest.
Currently these directories have different names and so tox
passes when run by zuul, but fails when run in a developer env.
This submission uses an env variable: "STX_PREFIX" to make
both envs able to run tox.
Story: 2004515
Task: 30664
Change-Id: I06cefab7422f53ccc0b8af30ca06945311cec70e
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>
65eaf645f4