Merge "libsnapshot: Use SnapshotManager to delete devices." am: 3de2320e5e

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2185322

Change-Id: Ia1e64f5e50652efedc9649d5bd7df3d5ba033531
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>