Activate MP Rest Client TCK with -Dts.ee9 profile; resolve failures

When the ee-9 modules were added I thought I had enabled the MP Rest Client TCK when the -Dts.ee9 profile was executed. It turns out I had not. The profile does the various set up work but the default-test surefire execution was not enabled, so the tests aren't actually run. I discovered this when working on WFLY-14049.

I believe 16 test will fail if it is enabled, so part of this task is to sort out what that's about.