Merge "Add an integration test to verify zero-length DHCP packet." am: 8da5ff4b5f am: db31cd21f4

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2554930

Change-Id: If0378bf6620f3bd728a62b5a980d805e4ce0f27a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>