api/service/bind: fix data races detected by `go test -race`
api/service/bind: fix data races detected by `go test -race`

guilhermebr/tsuru,guilhermebr/tsuru,tsuru/tsuru,tsuru/tsuru,RichardKnop/tsuru,hcxiong/tsuru,gwmoura/tsuru,cezarsa/tsuru,gciotta/tsuru,kgrvamsi/tsuru,firebitsbr/tsuru,mderaldo/tsuru,ggarnier/tsuru,mderaldo/tsuru,mderaldo/tsuru,Endika/tsuru,tuxmonteiro/tsuru,tuxmonteiro/tsuru,kgrvamsi/tsuru,Endika/tsuru,cgvarela/tsuru,cgvarela/tsuru,hcxiong/tsuru,tsuru/tsuru,kgrvamsi/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,ggarnier/tsuru,tuxmonteiro/tsuru,gwmoura/tsuru,ArxdSilva/tsuru,4eek/tsuru,jblancett/tsuru,hcxiong/tsuru,cgvarela/tsuru,RichardKnop/tsuru,hugoantunes/tsuru,cezarsa/tsuru,guilhermebr/tsuru,ggarnier/tsuru,guilhermebr/tsuru,tsuru/tsuru,firebitsbr/tsuru,gciotta/tsuru,cezarsa/tsuru,4eek/tsuru,ArxdSilva/tsuru,Endika/tsuru,hugoantunes/tsuru,ArxdSilva/tsuru,jblancett/tsuru,gciotta/tsuru,4eek/tsuru,RichardKnop/tsuru,firebitsbr/tsuru,jblancett/tsuru,gwmoura/tsuru,cezarsa/tsuru