Merge "fs_mgr_overlayfs: Try "/system" and "/" when setting "/system" shared...

Merge "fs_mgr_overlayfs: Try "/system" and "/" when setting "/system" shared type" am: 44f1f094 am: c57557ba am: b31d1e05 am: f26b137e

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2159442



Change-Id: I8cd90b8fc9213fa25bb99019c307456b5023ea55
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>