clean up & clarify code in yaws_api:setconf/3
clean up & clarify code in yaws_api:setconf/3

sebgod/yaws,ca91/yaws,leoliu/yaws,patternmatched/yaws,patternmatched/yaws,namjae/yaws,leoliu/yaws,bsmr-erlang/yaws,patternmatched/yaws,phonohawk/yaws,watonyweng/yaws,imtal/yaws,namjae/yaws,klacke/yaws,sebgod/yaws,phonohawk/yaws,weisslj/yaws,watonyweng/yaws,weisslj/yaws,bsmr-erlang/yaws,andreineculau/yaws,toraritte/azith,weisslj/yaws,andreineculau/yaws,zephyrean/yaws,capflam/yaws,weisslj/yaws,phonohawk/yaws,toraritte/azith,patternmatched/yaws,phonohawk/yaws,ca91/yaws,watonyweng/yaws,bsmr-erlang/yaws,capflam/yaws,watonyweng/yaws,imtal/yaws,sebgod/yaws,weisslj/yaws,toraritte/azith,capflam/yaws,zephyrean/yaws,ca91/yaws,klacke/yaws,klacke/yaws,zephyrean/yaws,imtal/yaws,ca91/yaws,phonohawk/yaws,andreineculau/yaws,zephyrean/yaws,phonohawk/yaws,namjae/yaws,zephyrean/yaws,weisslj/yaws,leoliu/yaws,bsmr-erlang/yaws,imtal/yaws,zephyrean/yaws,leoliu/yaws,sebgod/yaws,sebgod/yaws,imtal/yaws,leoliu/yaws,namjae/yaws,andreineculau/yaws,patternmatched/yaws,namjae/yaws,leoliu/yaws,toraritte/azith,imtal/yaws,bsmr-erlang/yaws,imtal/yaws,sebgod/yaws,phonohawk/yaws,patternmatched/yaws,watonyweng/yaws,leoliu/yaws,toraritte/azith,toraritte/azith,andreineculau/yaws,namjae/yaws,capflam/yaws,capflam/yaws,weisslj/yaws,klacke/yaws,capflam/yaws,klacke/yaws,zephyrean/yaws,ca91/yaws,klacke/yaws,patternmatched/yaws,bsmr-erlang/yaws,sebgod/yaws,klacke/yaws,ca91/yaws,bsmr-erlang/yaws,watonyweng/yaws,ca91/yaws,namjae/yaws,watonyweng/yaws,toraritte/azith,capflam/yaws