Fix missing tests

Use external Junit since the libcore one is no longer present.

Change-Id: I78dbe78304f8052cbab64316cdfd97d93ed237e9
diff --git a/tools/cts-java-scanner/src/com/android/cts/javascanner/DocletRunner.java b/tools/cts-java-scanner/src/com/android/cts/javascanner/DocletRunner.java
index 8a371fd..ae5b618 100644
--- a/tools/cts-java-scanner/src/com/android/cts/javascanner/DocletRunner.java
+++ b/tools/cts-java-scanner/src/com/android/cts/javascanner/DocletRunner.java
@@ -65,7 +65,7 @@
         List<String> sourcePath = new ArrayList<String>();
         sourcePath.add("./frameworks/base/core/java");
         sourcePath.add("./frameworks/base/test-runner/src");
-        sourcePath.add("./libcore/junit/src/main/java");
+        sourcePath.add("./external/junit/src");
         sourcePath.add("./development/tools/hosttestlib/src");
         sourcePath.add("./libcore/dalvik/src/main/java");
         sourcePath.add("./cts/tests/src");