Add missing files to ARM Dockerfile

Appears to have been missed during recent PRs from community.

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

gateway/Dockerfile.armhf

@@ -8,9 +8,11 @@ COPY handlers       handlers
 COPY metrics        metrics
 COPY requests       requests
 COPY tests          tests
+
 COPY types          types
-COPY plugin  	    plugin
-COPY queue  	    queue
+COPY queue          queue
+COPY plugin         plugin
+COPY version        version
 COPY server.go      .
 
 RUN GOARM=7 CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gateway .