Use the proper Bazel JUnit target
Use the proper Bazel JUnit target

This was working on my machine because my Bazel workspace path
included the Bazel workspace through .bazelrc. Now it uses the
proper workspace prefix so that it works with current Bazel
versions.

Change-Id: I8d133ec9d3ef1d0fbc75b5ad7fc4e960d8e5f6e1

google/copybara,google/copybara,google/copybara