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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5b6e68606ad584d5fb52c2906b7ccfba6106be64