Merge changes from topic "ka05"

* changes:
  [KA05] Export keepalive offload api for IpSec Nat-T file descriptor
  [KA01] export SocketKeepalive API for NAT-T keepalive
tree: 5c91e65776c8953176bd4c342f2592f106a6e79b
  1. core/
  2. services/
  3. tests/