RFR: JDK-8191856 "make clean-test" does not work properly

[Magnus Ihse Bursie]

With the new layout of make run-test, the test-results and test-support 
directories are not removed by "make clean-test", and not even "make 
clean".

Bug: https://bugs.openjdk.java.net/browse/JDK-8191856
Patch inline:
diff --git a/make/Main.gmk b/make/Main.gmk
--- a/make/Main.gmk
+++ b/make/Main.gmk
@@ -1049,7 +1049,7 @@
  # file.

  CLEAN_DIRS += hotspot jdk bootcycle-build test buildtools support \
-    images make-support test-make bundles buildjdk
+    images make-support test-make bundles buildjdk test-results 
test-support
  CLEAN_DIR_TARGETS := $(addprefix clean-, $(CLEAN_DIRS))
  CLEAN_SUPPORT_DIRS += demos
  CLEAN_SUPPORT_DIR_TARGETS := $(addprefix clean-, $(CLEAN_SUPPORT_DIRS))
@@ -1094,6 +1094,8 @@
  # while classes and touch files end up in jdk.
  clean-support: clean-jdk

+clean-test: clean-test-results clean-test-support
+
  # Remove everything, including configure configuration. If the output
  # directory was created by configure and now becomes empty, remove it 
as well.
  dist-clean: clean

/Magnus