When polling, expand the build parameters.

Have hidden build parameter(hidden parameters plugin ) called BRANCH.   Thus this can be treated as a constant.

I'd like to use ${BRANCH} in the client name for the polling, but the value of BRANCH is not made available.   (It is there for the build job)

Use case:

Overall goal would be to be able to create build jobs quickly when a new branch is created. Ideally, I just want to be able to create a new job by copying and simply change one or two variables - the branch and the build version number.