JDK 10 RFR of JDK-8184894: Mark ExternalEditorTest.java as intermittently failing, demote to tier 2

[Amy Lu]

jdk/jshell/ExternalEditorTest.java

This test has been seen to intermittently fail (JDK-8176253, 
JDK-8178353, JDK-8159229). It should be marked accordingly and demoted 
from tier 1 to tier 2 until the reliability issues are resolved.

Please review the patch to add intermittent key and change to tier2.

bug: https://bugs.openjdk.java.net/browse/JDK-8184894
webrev: http://cr.openjdk.java.net/~amlu/8184894/webrev.00/

Thanks,
Amy

--- old/test/TEST.groups	2017-07-19 09:32:05.000000000 +0800
+++ new/test/TEST.groups	2017-07-19 09:32:05.000000000 +0800
@@ -27,11 +27,13 @@
      jdk \
      lib \
      tools \
+    -jdk/jshell/ExternalEditorTest.java \
      -jdk/jshell/ToolReloadTest.java \
      -jdk/jshell/ToolLocaleMessageTest.java
  
  # (Almost) no langtools tests are tier 2.
  tier2 = \
+    jdk/jshell/ExternalEditorTest.java \
      jdk/jshell/ToolReloadTest.java \
      jdk/jshell/ToolLocaleMessageTest.java
  
--- old/test/jdk/jshell/ExternalEditorTest.java	2017-07-19 09:32:05.000000000 +0800
+++ new/test/jdk/jshell/ExternalEditorTest.java	2017-07-19 09:32:05.000000000 +0800
@@ -28,6 +28,7 @@
   * @modules jdk.jshell/jdk.internal.jshell.tool
   * @build ReplToolTesting CustomEditor EditorTestBase
   * @run testng ExternalEditorTest
+ * @key intermittent
   */
  
  import java.io.BufferedWriter;