os: make TestLchown actually test Lchown.
os: make TestLchown actually test Lchown.

TestLchown was creating a hard-link instead of a symlink. It would
have passed if you replaced all Lchown() calls in it with Chown().

Change-Id: I3a108948ec25fcbac8ea890a6eaf5bac094f0800
Reviewed-on: https://go-review.googlesource.com/17397
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

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