Merge "snapuserd_test: Create dup of fd before passing it to cow writer" into...

Merge "snapuserd_test: Create dup of fd before passing it to cow writer" into main am: 60d8d17f am: 3493355b

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3164443



Change-Id: Ib7e0a18f0e39e33aa421892c2816aa46381efc4a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>