Cleanup imports and vendor dependencies.

Signed-off-by: David Calavera <david.calavera@gmail.com>

Makefile

@@ -1,23 +1,23 @@
-.PHONY: all deps osxkeychain test
+.PHONY: all deps osxkeychain test validate wincred
 
 all: test
 
 deps:
-	go get -t ./...
 	go get github.com/golang/lint/golint
 
 osxkeychain:
 	mkdir -p bin
 	go build -o bin/docker-credential-osxkeychain osxkeychain/cmd/main_darwin.go
 
+test:
+	# tests all packages except vendor
+	go test -v `go list ./... | grep -v /vendor/`
+
+validate:
+	go vet ./credentials ./osxkeychain
+	golint `go list ./... | grep -v /vendor/`
+	gofmt -s -l `ls **/*.go | grep -v vendor`
+
 wincred:
 	mkdir -p bin
 	go build -o bin/docker-credential-wincred wincred/cmd/main_windows.go
-
-test:
-	go test -v ./...
-
-validate:
-	go vet ./...
-	golint ./...
-	gofmt -s -l .