s/getdns_strerror/getdns_get_errorstr_by_id/g
s/getdns_strerror/getdns_get_errorstr_by_id/g

In the unit tests make use of the newly exposed error string getter

huitema/getdns,shane-kerr/getdns,Acidburn0zzz/getdns,shane-kerr/getdns,Acidburn0zzz/getdns,glenwiley/getdns,glenwiley/getdns,glenwiley/getdns,glenwiley/getdns,smogali/getdns,Acidburn0zzz/getdns,dkg/getdns,dkg/getdns,shane-kerr/getdns,huitema/getdns,smogali/getdns,dkg/getdns,Acidburn0zzz/getdns,smogali/getdns,dkg/getdns,huitema/getdns,smogali/getdns,shane-kerr/getdns,huitema/getdns