Merge "Use a single thread executor for calculateHasIncompatibleAccounts" into udc-dev am: 25f954ed8c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24150783

Change-Id: Ide94a30619f802abbd1ae113ebe11886b31c76f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>