Merge "libsnapshot: Print merge completion ops" am: 51858a0494 am: 38a82623ef

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1584487

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ida43f88d5efb52726a6149da3b1954f6d62411a0