As discussed in HADOOP-11804 comment 15758048 and following comments, there are still dependencies on the now-removed hadoop-client jar. The current code builds only because an obsolete snapshot of the jar is found on the repository server. Changing the project version to something new exposes the problem.
While the build currently dies at hadoop-tools/hadoop-sls, I'm seeing issues with some Hadoop Client modules, too.
I'm filing a new bug because I can't reopen