Remove some dead code and eliminate one use case of $config['ipsec']['enable'].
Remove some dead code and eliminate one use case of $config['ipsec']['enable'].

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