User management and switching

Broadcast intents that get sent out when users are added/removed/switched.

More work on generating user-specific information in package manager queries.
APIs to update user name and query a user by id.
Removed Package.mSetStopped and mSetEnabled, since they're not user specific.

User removal:
- Cleanup ActivityManager, PackageManager, WallpaperManager, AppWidgetService
  and AccountManager.
- Shutdown processes belonging to the user.

Don't show vibrate option in long-press power if there's no vibrator.

Lock the screen when switching users, to force unlocking.

Change-Id: Ib23a721cb75285eef5fd6ba8c7272462764038fa
diff --git a/services/java/com/android/server/pm/PackageSettingBase.java b/services/java/com/android/server/pm/PackageSettingBase.java
index b7cf8d6..56f2166 100644
--- a/services/java/com/android/server/pm/PackageSettingBase.java
+++ b/services/java/com/android/server/pm/PackageSettingBase.java
@@ -273,4 +273,13 @@
             return COMPONENT_ENABLED_STATE_DEFAULT;
         }
     }
+
+    void removeUser(int userId) {
+        enabled.delete(userId);
+        stopped.delete(userId);
+        enabledComponents.delete(userId);
+        disabledComponents.delete(userId);
+        notLaunched.delete(userId);
+    }
+
 }