Add always-on VPN support for platform VPNs am: 16e0e33c71 am: 5c1e7a12c5

Change-Id: I4b1d796a7af3a9e421a330fd8ff713556c55dc67
tree: 7317ba26351dcffa47cc9f4210788e5298420206
  1. core/
  2. services/
  3. tests/