Revision 1776591

[MNG-5761] Dependency management is not transitive.

o Updated to add a missing test dependency (used but undeclared) managed to
  non-transitive test scope transitively. The compilation error without
  that declaration in fact is expected behaviour. Don't let them fool you.

  I can build all plugins using 3.4.0-SNAPSHOT by upgrading the plugin tools
  manually on the command line like:

  mvn -DmavenPluginToolsVersion=3.5 test-compile