Merge "Check if NetworkSpecifier is an instance of MatchAllNetworkSpecifier" am: d15fcc3048 am: b96b07febe

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1556546

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I061c38c83eedf9235d85c4353e88b72117d93b86