Fix bugs and crashes in PacketKeepalive API.

Bug: 22606153
Bug: 23820819
Bug: 23884210
Change-Id: I1bf82094ec664baed345e9fb137fada0cbf4b7a0
2 files changed
tree: 12ffb31f3a1b08bb70cc10c27b3f799b94c69596
  1. core/
  2. services/
  3. tests/