be sure to close connection after completion of xfr out. (#2866)
be sure to close connection after completion of xfr out. (#2866)

otherwise the connection and associated socket stay in the CLOSE_WAIT
state unless/until golang runtime performs GC.
miekg/coredns,miekg/coredns,ii/coredns,ii/coredns,chrisohaver/coredns,coredns/coredns,johnbelamaric/coredns,johnbelamaric/coredns,yongtang/coredns