Merge "Add tests for PAC proxies." am: 5e76b40973 am: 4155e6ec97 am: 4ae128e7e1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1729152

Change-Id: Ifc4c685e724de1c3727b560d0213b4257f71da54
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>