Correct the namespace of DeviceConfig in VpnTest am: d64b2b1bdd am: e8889a4589 am: 0c93c9d1f5

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2629811

Change-Id: I31c4cac02731851d51fd8210deae553763d47f89
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>