Merge "[VCN07.6] Add NOT_VCN_MANAGED for NetworkAgent implementations" am: ac0dbac04c am: 31522e92b4 am: c1f916005f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1562877

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2a1abdc5b48e8ed25f373183fb11a74f4ef4a1a1