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

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

Change-Id: I081803073ebfc190d32df7ec0ede21d7a7b3e268
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>