Fix #137
Fix #137

find_directive uses the unitialized member location in set_user_config when httpd.conf is present.  I changed set_user_config_file to use the root path as a start.
deserted/letsencrypt,DavidGarciaCat/letsencrypt,deserted/letsencrypt,dietsche/letsencrypt,bestwpw/letsencrypt,Hasimir/letsencrypt,rutsky/letsencrypt,TheBoegl/letsencrypt,solidgoldbomb/letsencrypt,riseofthetigers/letsencrypt,diracdeltas/lets-encrypt-preview,rutsky/letsencrypt,vcavallo/letsencrypt,mrb/letsencrypt,stewnorriss/letsencrypt,piru/letsencrypt,ruo91/letsencrypt,tdfischer/lets-encrypt-preview,bestwpw/letsencrypt,luorenjin/letsencrypt,twstrike/le_for_patching,PeterMosmans/letsencrypt,DavidGarciaCat/letsencrypt,solidgoldbomb/letsencrypt,hlieberman/letsencrypt,ruo91/letsencrypt,rugk/letsencrypt,kevinlondon/letsencrypt,xgin/letsencrypt,stewnorriss/letsencrypt,tdfischer/lets-encrypt-preview,rlustin/letsencrypt,kuba/letsencrypt,ahojjati/letsencrypt,VladimirTyrin/letsencrypt,jmaurice/letsencrypt,brentdax/letsencrypt,letsencrypt/letsencrypt,dietsche/letsencrypt,modulexcite/letsencrypt,bsmr-misc-forks/letsencrypt,TheBoegl/letsencrypt,Jadaw1n/letsencrypt,armersong/letsencrypt,wteiken/letsencrypt,modulexcite/letsencrypt,BKreisel/letsencrypt,jmhodges/letsencrypt,Sveder/letsencrypt,skynet/letsencrypt,sapics/letsencrypt,ahojjati/letsencrypt,lbeltrame/letsencrypt,hlieberman/letsencrypt,thanatos/lets-encrypt-preview,digideskio/lets-encrypt-preview,Hasimir/letsencrypt,BillKeenan/lets-encrypt-preview,jmhodges/letsencrypt,wteiken/letsencrypt,tyagi-prashant/letsencrypt,jmaurice/letsencrypt,BKreisel/letsencrypt,hsduk/lets-encrypt-preview,beermix/letsencrypt,sapics/letsencrypt,kuba/letsencrypt,PeterMosmans/letsencrypt,g1franc/lets-encrypt-preview,sjerdo/letsencrypt,letsencrypt/letsencrypt,vcavallo/letsencrypt,jtl999/certbot,hsduk/lets-encrypt-preview,kevinlondon/letsencrypt,thanatos/lets-encrypt-preview,jsha/letsencrypt,Sveder/letsencrypt,fmarier/letsencrypt,diracdeltas/lets-encrypt-preview,xgin/letsencrypt,mrb/letsencrypt,ghyde/letsencrypt,Jonadabe/letsencrypt,Bachmann1234/letsencrypt,jsha/letsencrypt,jtl999/certbot,ghyde/letsencrypt,lbeltrame/letsencrypt,twstrike/le_for_patching,armersong/letsencrypt,Jadaw1n/letsencrypt,riseofthetigers/letsencrypt,digideskio/lets-encrypt-preview,mitnk/letsencrypt,BillKeenan/lets-encrypt-preview,rlustin/letsencrypt,Jonadabe/letsencrypt,beermix/letsencrypt,luorenjin/letsencrypt,stweil/letsencrypt,mitnk/letsencrypt,lmcro/letsencrypt,brentdax/letsencrypt,Bachmann1234/letsencrypt,martindale/letsencrypt,g1franc/lets-encrypt-preview,goofwear/letsencrypt,piru/letsencrypt,skynet/letsencrypt,bsmr-misc-forks/letsencrypt,goofwear/letsencrypt,tyagi-prashant/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,VladimirTyrin/letsencrypt,sjerdo/letsencrypt,rugk/letsencrypt,fmarier/letsencrypt,martindale/letsencrypt