Merge "Immediately create native networks when NetworkAgents register." am: 18cdec34dd am: c23446db3e am: b0d702634d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2162425

Change-Id: I0b9e390ee62289df0d2dacb5d9477afab9a1cd76
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>