Vendor new queue-worker version

Introduces 0.4.6 of queue-worker - see upstream repo for changes.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

gateway/vendor/github.com/openfaas/nats-queue-worker/Dockerfile.armhf

@@ -0,0 +1,27 @@
+FROM golang:1.9.7-alpine as golang
+WORKDIR /go/src/github.com/openfaas/nats-queue-worker
+
+COPY vendor     vendor
+COPY handler    handler
+COPY main.go  .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
+
+FROM alpine:3.7
+
+RUN addgroup -S app \
+  && adduser -S -g app app \
+  && apk add --no-cache ca-certificates
+
+WORKDIR /home/app
+
+EXPOSE 8080
+ENV http_proxy      ""
+ENV https_proxy     ""
+
+COPY --from=golang /go/src/github.com/openfaas/nats-queue-worker/app    .
+
+RUN chown -R app:app ./
+
+USER app
+CMD ["./app"]