Add fire_callback for clearing outstanding requests
Add fire_callback for clearing outstanding requests

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