net/http/httputil: add package level examples
net/http/httputil: add package level examples

Change-Id: I5be18b68602a7ebb740cf05924236ce17e386e55
Reviewed-on: https://go-review.googlesource.com/17295
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

roth1002/go,kim-racktop/go,deft-code/go,golang/go,CAFxX/go,Endika/go,momchil-velikov/go,suncycheng/go,akutz/go,fjballest/golang,miolini/go,josharian/go,suncycheng/go,vsekhar/elastic-go,4ad/go,derekmarcotte/go,ganboing/go-esx,polyverse-security/go,cyberroadie/go,akutz/go,sndnvaps/go,miolini/go,goodlang/good,CAFxX/go,golang/go,CAFxX/go,vanloswang/go,ganboing/go-esx,linux-on-ibm-z/go,deft-code/go,vsekhar/elastic-go,derekmarcotte/go,theif519/go,goodlang/good,miolini/go,kim-racktop/go,Cofyc/go,cloudflare/go,sndnvaps/go,4ad/go,goodlang/good,Cofyc/go,cyberroadie/go,binarycrusader/go,binarycrusader/go,mwhudson/go,ImJasonH/go,vsekhar/elastic-go,linux-on-ibm-z/go,suncycheng/go,akutz/go,ganboing/go-esx,theif519/go,CAFxX/go,momchil-velikov/go,Cofyc/go,Endika/go,sndnvaps/go,codestation/go,josharian/go,ganboing/go-esx,binarycrusader/go,cyberroadie/go,odeke-em/go,roth1002/go,Samurais/go,cloudflare/go,sndnvaps/go,mwhudson/go,vsekhar/elastic-go,mwhudson/go,goodlang/good,binarycrusader/go,Endika/go,josharian/go,deft-code/go,binarycrusader/go,ganboing/go-esx,ImJasonH/go,vanloswang/go,Endika/go,cloudflare/go,cyberroadie/go,polyverse-security/go,cloudflare/go,codestation/go,Samurais/go,roth1002/go,odeke-em/go,binarycrusader/go,polyverse-security/go,kim-racktop/go,sndnvaps/go,momchil-velikov/go,nawawi/go,vanloswang/go,4ad/go,4ad/go,ImJasonH/go,vsekhar/elastic-go,akutz/go,ganboing/go-esx,codestation/go,cloudflare/go,miolini/go,ImJasonH/go,Samurais/go,derekmarcotte/go,odeke-em/go,cyberroadie/go,golang/go,ImJasonH/go,vsekhar/elastic-go,miolini/go,4ad/go,polyverse-security/go,Samurais/go,nawawi/go,linux-on-ibm-z/go,codestation/go,theif519/go,ImJasonH/go,cloudflare/go,golang/go,josharian/go,vanloswang/go,linux-on-ibm-z/go,goodlang/good,mwhudson/go,Cofyc/go,theif519/go,momchil-velikov/go,cyberroadie/go,josharian/go,derekmarcotte/go,ganboing/go-esx,nawawi/go,linux-on-ibm-z/go,polyverse-security/go,codestation/go,4ad/go,vanloswang/go,miolini/go,CAFxX/go,CAFxX/go,fjballest/golang,4ad/go,derekmarcotte/go,ImJasonH/go,Endika/go,cyberroadie/go,akutz/go,Cofyc/go,roth1002/go,fjballest/golang,deft-code/go,derekmarcotte/go,fjballest/golang,akutz/go,Endika/go,christopher-henderson/Go,nawawi/go,derekmarcotte/go,Samurais/go,roth1002/go,Samurais/go,linux-on-ibm-z/go,ImJasonH/go,CAFxX/go,binarycrusader/go,suncycheng/go,mwhudson/go,Samurais/go,codestation/go,goodlang/good,suncycheng/go,fjballest/golang,deft-code/go,nawawi/go,Samurais/go,miolini/go,odeke-em/go,josharian/go,4ad/go,kim-racktop/go,sndnvaps/go,momchil-velikov/go,nawawi/go,goodlang/good,Cofyc/go,theif519/go,polyverse-security/go,roth1002/go,ganboing/go-esx,binarycrusader/go,kim-racktop/go,miolini/go,vsekhar/elastic-go,Cofyc/go,golang/go,cyberroadie/go,akutz/go,golang/go,akutz/go,polyverse-security/go,suncycheng/go,mwhudson/go,odeke-em/go,theif519/go,roth1002/go,momchil-velikov/go,josharian/go,codestation/go,odeke-em/go,derekmarcotte/go,Endika/go,linux-on-ibm-z/go,vanloswang/go,goodlang/good,deft-code/go,codestation/go,nawawi/go,sndnvaps/go,odeke-em/go,fjballest/golang,deft-code/go,fjballest/golang,kim-racktop/go,kim-racktop/go,cloudflare/go,polyverse-security/go,golang/go,CAFxX/go,momchil-velikov/go,suncycheng/go,vsekhar/elastic-go,sndnvaps/go,Cofyc/go,odeke-em/go,roth1002/go,fjballest/golang,theif519/go,josharian/go,mwhudson/go,golang/go,linux-on-ibm-z/go,cloudflare/go,suncycheng/go,deft-code/go,mwhudson/go,kim-racktop/go,vanloswang/go,Endika/go,theif519/go,nawawi/go,momchil-velikov/go,vanloswang/go