Squashed 'hack/libbuild/' changes from da3abb93..70ef1128

70ef1128 fix branch naming issue (#23)

git-subtree-dir: hack/libbuild
git-subtree-split: 70ef11282ee43c0ba11ee94e9e3d4d008b82498e

concourse/init.sh

@@ -20,9 +20,5 @@ pushd "$GOPATH"/src/github.com/$ORG_NAME/$REPO_NAME
 # this is necessary because operator image tag is based on branch name
 # for parallel tests, if two test build image of same tag, it'll create problem
 # one test may finish early and delete image while other is using it
-if (git branch -m "$(git rev-parse --abbrev-ref HEAD)-$ClusterProvider"); then
-  true
-else
-  git checkout -b $(git rev-parse --short HEAD)-$ClusterProvider
-fi
+git checkout -b $(git rev-parse --short HEAD)-$ClusterProvider
 popd