Update directories when initializing ContactsProvider.

This is to fix a bug when reading exchange provider. Updating directories
can fix it without factory reset or account changed.

BUG 22398175

Change-Id: I36e05ff5f7bc83dc25ab165e5f5fb122bbe6c160
diff --git a/src/com/android/providers/contacts/ContactsProvider2.java b/src/com/android/providers/contacts/ContactsProvider2.java
index 7dc7e7e..8904dc1 100644
--- a/src/com/android/providers/contacts/ContactsProvider2.java
+++ b/src/com/android/providers/contacts/ContactsProvider2.java
@@ -1687,6 +1687,7 @@
                 initForDefaultLocale();
                 mReadAccessLatch.countDown();
                 mReadAccessLatch = null;
+                updateDirectoriesInBackground(true);
                 break;
             }