Merge "[Thread] move infra network utilities to IntegrationTestUtils.kt" into main am: 7c831a94c6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3254279

Change-Id: I70a58f0e030b728cd811f75ae3674695c97921af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>