Add deadcode linter

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: 62c1f0ef41e6cd88a8846da1c11976a320ca8b41
Component: engine

components/engine/hack/dockerfile/install-binaries.sh

@@ -60,12 +60,7 @@ install_gometalinter() {
 	cd "$GOPATH/src/github.com/alecthomas/gometalinter"
 	git checkout -q "$GOMETALINTER_COMMIT"
 	go build -o /usr/local/bin/gometalinter github.com/alecthomas/gometalinter
-	(
-		export GOBIN=/usr/local/bin
-		export GOPATH="$PWD/_linters/"
-		go install github.com/golang/lint/golint
-		go install golang.org/x/tools/cmd/goimports
-	)
+	GOBIN=/usr/local/bin gometalinter --install
 }
 
 for prog in "$@"

components/engine/hack/validate/gometalinter.json

@@ -10,6 +10,7 @@
   ],
 
   "Enable": [
+    "deadcode",
     "gofmt",
     "goimports",
     "golint",