Merge "Support parsing VcnGatewayConnectionConfig without UnderlyingNetworkPriorities" am: 1a0f225c83 am: b3a9bce506

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1915377

Change-Id: I5db17a735ba43fe3e75eb244dc9c78ec42b91a19