Merge "Update DscpPolicyTest to use random IPv6 prefixes." am: f627616fe3

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2173586

Change-Id: Id32b9a88095818e7f91940d48947334cc1c217e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>