Bind mount pkg specific dirs in the zygote child namespaces.

- Also update vold to create sandboxes for secondary storage devices.
- Since bind mounts are created in the process specific namespaces, we
  don't need /mnt/storage anymore which we were using it to prevent
  some bind mounts from propagating onto /mnt/runtime/write.
- Create bind mounts for {media,obb} dirs similar to data dir in
  per process namespace.
- Also fix a bug where we are not passing correct packages to vold when
  a new user starts.

Bug: 111890351
Test: manual
Change-Id: I7849efc4fbf3c654606fa30de7ab2de0236d766f
diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index dcf3546..08ed4cd 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -445,10 +445,16 @@
     vol->setMountUserId(mountUserId);
 
     int res = vol->mount();
-    if ((mountFlags & MOUNT_FLAG_PRIMARY) != 0) {
-        VolumeManager::Instance()->setPrimary(vol);
+    if (res != OK) {
+        return translate(res);
     }
-    return translate(res);
+    if ((mountFlags & MOUNT_FLAG_PRIMARY) != 0) {
+        res = VolumeManager::Instance()->setPrimary(vol);
+        if (res != OK) {
+            return translate(res);
+        }
+    }
+    return translate(OK);
 }
 
 binder::Status VoldNativeService::unmount(const std::string& volId) {