
The usage of zuul-cloner in tox_install breaks post and periodic jobs. Update the script, it does not need to handle unconstrainted installs anymore (see tox.ini). There's no need to set ZUUL_BRANCH explicitely - it's set via the environment and branch is passed in as well. Note that this script is needed for the edit-constraints call, add a comment. Change-Id: I0077c986a17d6bb92791474e03d1e77776e9382f Closes-Bug: #1615430