Support ANDROID_LOG_TAGS.

This is the dalvik-compatible solution to the "I don't want non-FATAL logging
in my test output" problem.

Change-Id: I51b7b883ce89604af4661696e7c7b041a0ef8211
diff --git a/test/etc/reference-run-test-classes b/test/etc/reference-run-test-classes
index b16d9ff..0294cc2 100755
--- a/test/etc/reference-run-test-classes
+++ b/test/etc/reference-run-test-classes
@@ -53,7 +53,8 @@
 
 if [ "$DEBUG" = "y" ]; then
     PORT=8000
-    msg "Waiting for debugger to connect on localhost:$PORT"
+    msg "Waiting for jdb to connect:"
+    msg "    jdb -attach localhost:$PORT"
     DEBUG_OPTS="-agentlib:jdwp=transport=dt_socket,address=$PORT,server=y,suspend=y"
 fi