JDK 9 RFR of JDK-8177313: Move FJExceptionTableLeak.java and ConfigChanges.java back to tier1

[Amy Lu]

Below two tests was demoted from tier1 to tier2 due to test fails 
intermittently:

java/util/concurrent/forkjoin/FJExceptionTableLeak.java
      JDK-8144990, JDK-8151158
java/util/concurrent/ThreadPoolExecutor/ConfigChanges.java
     JDK-8139237, JDK-8169243

Mentioned issues have been resolved and no open bug (no failure 
reported) till now.

This patch is to move them back to tier1.

bug: https://bugs.openjdk.java.net/browse/JDK-8177313

Thanks,
Amy


--- old/test/TEST.groups    2017-03-21 16:07:55.000000000 +0800
+++ new/test/TEST.groups    2017-03-21 16:07:54.000000000 +0800
@@ -28,8 +28,6 @@
  tier1 = \
      :jdk_lang \
      :jdk_util \
-    -java/util/concurrent/ThreadPoolExecutor/ConfigChanges.java \
-    -java/util/concurrent/forkjoin/FJExceptionTableLeak.java \
      sun/nio/cs/ISO8859x.java \
      java/nio/Buffer \
      com/sun/crypto/provider/Cipher \
@@ -37,8 +35,6 @@
      tools/pack200

  tier2 = \
-    java/util/concurrent/ThreadPoolExecutor/ConfigChanges.java \
-    java/util/concurrent/forkjoin/FJExceptionTableLeak.java \
      :jdk_io \
      :jdk_nio \
      -sun/nio/cs/ISO8859x.java \