Disable CryptKeeper activity for secondary users

For secondary users, disable CryptKeeper activity in a broadcast receiver of
USER_INITIALIZE intent. This change has the following benefits for guest
user switching:
 - The code will be executed earlier in the user switching flow, when the
   screen is frozen by WindowManager.
 - Initialization of CryptKeeperActivity is skipped

Bug:18670536
Change-Id: I60300198b605c26ad15afe2c874d5f1be7da5087
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 80092b2..f9f259b 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1726,6 +1726,12 @@
             </intent-filter>
         </activity>
 
+        <receiver android:name=".CryptKeeper$UserInitBroadcastReceiver" >
+            <intent-filter>
+                <action android:name="android.intent.action.USER_INITIALIZE" />
+            </intent-filter>
+        </receiver>
+
         <activity android:name=".CryptKeeper$FadeToBlack"
             android:immersive="true"
             android:launchMode="singleTop"