Verify that VPN name is set in VPN networks am: 5ee9dedb0f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2732954

Change-Id: I4c645f688990ad815915b7f09e81fdbfe3bc4f5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>