Merge changes from topic "tcp_keepalive_fix"

* changes:
  Use API TcpKeepalivePacketData in ClientModeImpl
  Add TcpKeepalivePacketData to SystemApi
tree: d461d85c01929bc4811b6fdd49998b1db1ddc929
  1. framework/
  2. OsuLogin/
  3. OWNERS