go_repository: fail when http / vcs attributes are mixed (#1247)
go_repository: fail when http / vcs attributes are mixed (#1247)

Related #1244
Xjs/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,Xjs/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,Xjs/rules_go,bazelbuild/rules_go,Xjs/rules_go,Xjs/rules_go