Merge "Warn that reboot might be needed after setting IDs" into main am: a8934ddc

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3046693



Change-Id: I6a38724715144f93b1d218d15d7c937865b58528
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>