Merge changes from topic "cherrypicker-L41300000961223553:N33900001378015350" into udc-dev

* changes:
  Stop TCP keepalive from CS for fd initiated stop events
  FinalizePausedKeepalive in handleStopAllKeepalives.
  Add tests for pause, resume and stop keepalives.
  Ensure autoKi is not stored when keepalive stops or is not started.
  Add tests for NATT keepalives stopped internally in KeepaliveTracker.