Package restrictions per user

Packages can be enabled/disabled per user.
This requires maintaining stopped/launched states and
enabled / disabled components and packages per user.

Refactored pm.Settings and PackageSettingsBase to keep
track of states per user.

Migrated the stopped-packages.xml to users/<u>/package-restrictions.xml

Changed intent resolution to handle individual user restrictions.
Bunch of IPackageManager calls now have a userId argument.
Make AppWidgetService handle removals of packages.

Added some tests for pm.Settings and PackageManager.

Change-Id: Ia83b529e1df88dbcb3bd55ebfc952a6e9b20e861
diff --git a/services/java/com/android/server/pm/UserManager.java b/services/java/com/android/server/pm/UserManager.java
index 5eacf4a..959e570 100644
--- a/services/java/com/android/server/pm/UserManager.java
+++ b/services/java/com/android/server/pm/UserManager.java
@@ -73,6 +73,9 @@
     UserManager(File dataDir, File baseUserPath) {
         mUsersDir = new File(dataDir, USER_INFO_DIR);
         mUsersDir.mkdirs();
+        // Make zeroth user directory, for services to migrate their files to that location
+        File userZeroDir = new File(mUsersDir, "0");
+        userZeroDir.mkdirs();
         mBaseUserPath = baseUserPath;
         FileUtils.setPermissions(mUsersDir.toString(),
                 FileUtils.S_IRWXU|FileUtils.S_IRWXG