plugins: pidfile: reduce log noise
plugins: pidfile: reduce log noise

With the new practise of keeping record of process pid files, we no
longer need to log/update when reading back the same PID we already
have on file.

Signed-off-by: Joachim Wiberg <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit