net: stop scanning for domain name once the first label has been found
net: stop scanning for domain name once the first label has been found

Change-Id: I95c6c85eecb53ffe52b64d521180148b624e9424
Reviewed-on: https://go-review.googlesource.com/18423
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

cloudflare/go,Cofyc/go,ImJasonH/go,golang/go,linux-on-ibm-z/go,Endika/go,sndnvaps/go,akutz/go,momchil-velikov/go,miolini/go,ImJasonH/go,theif519/go,polyverse-security/go,momchil-velikov/go,vanloswang/go,ganboing/go-esx,binarycrusader/go,Endika/go,Samurais/go,codestation/go,codestation/go,goodlang/good,golang/go,cyberroadie/go,binarycrusader/go,Cofyc/go,christopher-henderson/Go,sndnvaps/go,Cofyc/go,Cofyc/go,cloudflare/go,momchil-velikov/go,akutz/go,miolini/go,sndnvaps/go,vsekhar/elastic-go,golang/go,CAFxX/go,ganboing/go-esx,codestation/go,CAFxX/go,Endika/go,suncycheng/go,ImJasonH/go,theif519/go,Cofyc/go,cyberroadie/go,derekmarcotte/go,momchil-velikov/go,cyberroadie/go,theif519/go,vanloswang/go,golang/go,mwhudson/go,nawawi/go,codestation/go,momchil-velikov/go,goodlang/good,vsekhar/elastic-go,ImJasonH/go,mwhudson/go,4ad/go,suncycheng/go,mwhudson/go,Samurais/go,theif519/go,codestation/go,derekmarcotte/go,binarycrusader/go,Endika/go,4ad/go,sndnvaps/go,Endika/go,sndnvaps/go,vsekhar/elastic-go,cyberroadie/go,CAFxX/go,cloudflare/go,akutz/go,vanloswang/go,derekmarcotte/go,Endika/go,4ad/go,Samurais/go,CAFxX/go,linux-on-ibm-z/go,cloudflare/go,Cofyc/go,cyberroadie/go,ImJasonH/go,miolini/go,golang/go,vanloswang/go,ImJasonH/go,Samurais/go,nawawi/go,CAFxX/go,4ad/go,Cofyc/go,4ad/go,codestation/go,polyverse-security/go,linux-on-ibm-z/go,vanloswang/go,josharian/go,akutz/go,vsekhar/elastic-go,linux-on-ibm-z/go,ganboing/go-esx,vsekhar/elastic-go,sndnvaps/go,vsekhar/elastic-go,mwhudson/go,nawawi/go,4ad/go,theif519/go,nawawi/go,cyberroadie/go,nawawi/go,josharian/go,derekmarcotte/go,Samurais/go,cloudflare/go,codestation/go,CAFxX/go,polyverse-security/go,linux-on-ibm-z/go,akutz/go,linux-on-ibm-z/go,CAFxX/go,suncycheng/go,derekmarcotte/go,josharian/go,theif519/go,momchil-velikov/go,derekmarcotte/go,Endika/go,polyverse-security/go,polyverse-security/go,derekmarcotte/go,codestation/go,mwhudson/go,polyverse-security/go,goodlang/good,akutz/go,polyverse-security/go,golang/go,vanloswang/go,mwhudson/go,suncycheng/go,linux-on-ibm-z/go,nawawi/go,Cofyc/go,goodlang/good,miolini/go,Endika/go,momchil-velikov/go,Samurais/go,ImJasonH/go,vsekhar/elastic-go,ganboing/go-esx,golang/go,mwhudson/go,josharian/go,golang/go,akutz/go,binarycrusader/go,goodlang/good,cloudflare/go,suncycheng/go,ImJasonH/go,nawawi/go,vanloswang/go,binarycrusader/go,mwhudson/go,josharian/go,ganboing/go-esx,4ad/go,suncycheng/go,goodlang/good,josharian/go,sndnvaps/go,binarycrusader/go,miolini/go,binarycrusader/go,cyberroadie/go,cloudflare/go,goodlang/good,akutz/go,momchil-velikov/go,polyverse-security/go,ganboing/go-esx,CAFxX/go,cyberroadie/go,ganboing/go-esx,Samurais/go,miolini/go,miolini/go,nawawi/go,vsekhar/elastic-go,Samurais/go,cloudflare/go,miolini/go,theif519/go,josharian/go,binarycrusader/go,goodlang/good,sndnvaps/go,suncycheng/go,4ad/go,suncycheng/go,linux-on-ibm-z/go,theif519/go,ganboing/go-esx,josharian/go,derekmarcotte/go,vanloswang/go