Merge "Add CTS tests for user agent." am: 0ba615423c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2470103

Change-Id: Icbe43e0d3ce9302b34926b3b949591cf6eac62a6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>