Perform VPN data stall recovery on unvalidated VPN network am: b4f300d7

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2643292



Change-Id: I2d84c81a4444bf65b309541f7716bd8d0dd6a568
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>