TS-645: remove calls in which hard restart is used

It's hard to tell what this is useful for when you have upstart,
systemd, SMF and others controling.  Aside from being implemented
poorly via system(3), it's an API breakage, which is why we're
putting it into 5.0.x
TS-645: remove references to StartTrafficServer() and StopTrafficServer()

The reason we remove those functions (ConfigClock, ConfigDate,
ConfitTime, etc..) is because they are entirely Linux specific, use
hard-coded paths, and assume that our Admins, while clue-less, will know
how to use this undocumented traffic_shell program
TS-645: remove StopTrafficServer() and StartTrafficServer() from traffic_shell