Re-vendor queue-worker publisher for reconnect

- re-vendor queue-worker for publisher via 0.6.0
- bump queue-worker version to 0.6.0 in docker-compose.yml for
AMD64
- use new naming for NATS of nats -> NATS in variables where
required
- add default reconnect of 60 times, 2 seconds apart.

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

gateway/vendor/github.com/openfaas/nats-queue-worker/Dockerfile.arm64

@@ -0,0 +1,32 @@
+FROM golang:1.10-alpine as golang
+WORKDIR /go/src/github.com/openfaas/nats-queue-worker
+
+COPY vendor     vendor
+COPY handler    handler
+COPY nats	nats
+COPY auth.go		.
+COPY readconfig.go 	.
+COPY readconfig_test.go .
+COPY main.go  		.
+
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
+
+FROM alpine:3.8
+
+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"]