Factor out stdout/stderr redirection to from service_start()
Factor out stdout/stderr redirection to from service_start()

This new function can then be used also by service_stop(), e.g. for SysV
start/stop scripts.

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

troglobit/finit,troglobit/finit