Merge "Disable IPv6 stack when IPv6 provisioning is lost but IPv4 is still...

Merge "Disable IPv6 stack when IPv6 provisioning is lost but IPv4 is still alive." am: dd369468 am: e32892e9 am: 62c43b4f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1315221

Change-Id: Ic717a0a406a84ab57b84b461215ddce802a32214