Add kotlin-reflect to net-tests-utils am: 01645f1698 am: 762a3ee400

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1532943

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0ccf689f2a84a07727b7af05616633d8dbc0ef12