[MENFORCER-281] RequirePluginVersions broken with "CI Friendly versions"
 o Followup
   o Added selector condition to limit execution to Maven 3.5.0+
     for the invoker integration test.
   o Replaced EnforcerRuleUtils.getModelsRecursively
     method with session.getProjectDependencyGraph().getSortedProjects()
   o Removed the testGetAllPlugins() and all related tests
     from TestEnforcerRuleUtils cause it only tests the
     getModelsRecursively method. Left only a static method
     and renamed to EnforcerRuleUtilsHelper cause it's
     used in some Tests.
9 files changed