Merge changes Ibff278a6,If6d537a3

* changes:
  Revert "Add NATT keepalive resources and methods into IpSecService"
  Revert "[KA11] Verify fd ownership and allocate resource for NattKeepalive"
tree: 475f41c06998ced7722645620b948a6fb1435488
  1. core/
  2. services/
  3. tests/