Merge "dscpPolicyTest: make it actually test caching" into main am: 3e213ffa46 am: 0315538ed7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3255782

Change-Id: Ia47410d8536b5609d6e295022ca101a5e77a7021
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>