Add support for <logging><custom_php_logging_command>.
Add support for <logging><custom_php_logging_command>.

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