JENKINS-11013 NOT_BUILT & other build status are reported inconsistently

The parent matrix build console output does not record the build status for
each job. That is useful to get a quick feel for the status of each job and
the order of execution/completion.

core/src/main/java/hudson/matrix/MatrixBuild.java

@@ -287,6 +287,7 @@ public class MatrixBuild extends AbstractBuild<MatrixProject,MatrixBuild> {
                     if(p.isRunSequentially())
                         scheduleConfigurationBuild(logger, c);
                     Result buildResult = waitForCompletion(listener, c);
+                    logger.println(Messages.MatrixBuild_Completed(c.getDisplayName(), buildResult));
                     r = r.combine(buildResult);
                 }