Add default argument for dump_clog's $grepfor.
Add default argument for dump_clog's $grepfor.

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