Merge "Force only system uid can set uids allowed on restricted networks" into sc-dev am: 77739d37b3 am: 93e9d0c1f6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/15172131

Change-Id: Ic1e1573a486e4483f2d59187e2313dde64e80e75