[grid] Pulling images from custom registries

Fixes SeleniumHQ/docker-selenium#1264

Author: diemol

java/server/src/org/openqa/selenium/docker/v1_40/PullImage.java

@@ -47,10 +47,11 @@ public void apply(Reference ref) {
 
     LOG.info("Pulling " + ref);
 
+    String image = String.format("%s/%s/%s", ref.getDomain(), ref.getRepository(), ref.getName());
     HttpRequest req = new HttpRequest(POST, "/v1.40/images/create")
       .addHeader("Content-Type", JSON_UTF_8)
       .addHeader("Content-Length", "0")
-      .addQueryParameter("fromImage", String.format("%s/%s", ref.getRepository(), ref.getName()));
+      .addQueryParameter("fromImage", image);
 
     if (ref.getDigest() != null) {
       req.addQueryParameter("tag", ref.getDigest());