Update vold to prepare package sandboxes for primary volume.

Vold is updated to create package specific sandboxes for primary
volume and mount them at
"/mnt/user/<user-id>/package/<package-name>/<primary-label>".
This will later be mounted at /storage when a new process starts.

Bug: 111890351
Test: Manually verified that a package has access to "/sdcard" and
      "/storage/emulated/0", both of which are just the package specific
      sandboxes and the package doesn't have access to other sandboxes
      and can't see other package names.

Change-Id: I72dc8ae9eb2260a298159c5de18387dad2f9de48
diff --git a/model/EmulatedVolume.cpp b/model/EmulatedVolume.cpp
index 6e1ffce..25ea602 100644
--- a/model/EmulatedVolume.cpp
+++ b/model/EmulatedVolume.cpp
@@ -17,8 +17,8 @@
 #include "EmulatedVolume.h"
 #include "Utils.h"
 
-#include <android-base/stringprintf.h>
 #include <android-base/logging.h>
+#include <android-base/stringprintf.h>
 #include <cutils/fs.h>
 #include <private/android_filesystem_config.h>
 #include <utils/Timers.h>
@@ -69,6 +69,7 @@
 
     setInternalPath(mRawPath);
     setPath(StringPrintf("/storage/%s", label.c_str()));
+    setLabel(label);
 
     if (fs_prepare_dir(mFuseDefault.c_str(), 0700, AID_ROOT, AID_ROOT) ||
             fs_prepare_dir(mFuseRead.c_str(), 0700, AID_ROOT, AID_ROOT) ||