Turn on verbose logging to debug flaky test cases

We have some flaky test cases about recurrent event that fail sometime in
nexus9, turn on DEBUG_INSTANCES flag for more logging.

ag/729934 turn on verbose logging when running cts.

Bug: 22449592

Change-Id: I728a07fa41251a92aa3d786932dddf7cfbc433df
diff --git a/src/com/android/providers/calendar/CalendarProvider2.java b/src/com/android/providers/calendar/CalendarProvider2.java
index c323bfe..888600e 100644
--- a/src/com/android/providers/calendar/CalendarProvider2.java
+++ b/src/com/android/providers/calendar/CalendarProvider2.java
@@ -89,7 +89,8 @@
 
 
     protected static final String TAG = "CalendarProvider2";
-    static final boolean DEBUG_INSTANCES = false;
+    // Turn on for b/22449592
+    static final boolean DEBUG_INSTANCES = Log.isLoggable(TAG, Log.DEBUG);
 
     private static final String TIMEZONE_GMT = "GMT";
     private static final String ACCOUNT_SELECTION_PREFIX = Calendars.ACCOUNT_NAME + "=? AND "