Write keepalive metrics periodically using alarms. am: 36a18e66

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23723905



Change-Id: I096ee4c27c48801b61724fe70b0a757236daec75
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>