Merge "add congestion control test to CTS" am: be66108f84 am: 9177e7bbec

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2578355

Change-Id: Ib713d1dff95bfa4619bff50ac766472d05738112
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>