Make isvalidpid() know about pidfile the same as the other *pid functions do.(consistency)
Make isvalidpid() know about pidfile the same as the other *pid functions do.(consistency)

ch1c4um/pfsense,dennypage/pfsense,ch1c4um/pfsense,brunostein/pfsense,jxmx/pfsense,NewEraCracker/pfsense,ch1c4um/pfsense,ptorsten/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,brunostein/pfsense,jxmx/pfsense,brunostein/pfsense,NOYB/pfsense,BlackstarGroup/pfsense,ptorsten/pfsense,phil-davis/pfsense,ch1c4um/pfsense,dennypage/pfsense,pfsense/pfsense,NOYB/pfsense,NewEraCracker/pfsense,pfsense/pfsense,pfsense/pfsense,BlackstarGroup/pfsense,jxmx/pfsense,pfsense/pfsense,ptorsten/pfsense,BlackstarGroup/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,dennypage/pfsense,NewEraCracker/pfsense,dennypage/pfsense,phil-davis/pfsense,NOYB/pfsense