Merge "Always run ensureInAppMountNamespace() to make sure app process runs in its mount namespace" am: 52c968759a am: 0aa41b3b5e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1554432

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iea3e49f9330572a66faff640d2343c020d52d3ae