PPSI/ptp-noposix doesn't follow large offset jump
If Slave is in TRACK_PHASE state and a time jump occurs it doesn't
reset its servo. It stays in TRACK_PHASE forever with a huge offset.
That is something we've already observed in AD test system for
Jean-Claude when GrandMaster was unlocking from the reference GPS. Not
following the time jump is also a problem if we power on all the switches in the chain with GrandMaster on the top in the same time. It takes some time for GM to lock so the network would start as free-running to the second switch in the chain, but once GM is
synchronized all slaves will stay in TRACK_PHASE with large offset to the GrandMaster.