Merge "Close DB file after running unit tests." into udc-dev am: 83a0e702

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/22429118



Change-Id: If8a224f5ba1a32294f97628d7dfbb1f6d5ae4f66
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>