Upgrade to 3.10.0 (SeleniumHQ#684)

* Upgrading to 3.10.0

* New NPE makes hub fail on startup, and this is not needed anymore.

Author: diemol

Base/Dockerfile

@@ -56,5 +56,5 @@ USER seluser
 #==========
 RUN  sudo mkdir -p /opt/selenium \
   && sudo chown seluser:seluser /opt/selenium \
-  && wget --no-verbose https://selenium-release.storage.googleapis.com/3.9/selenium-server-standalone-3.9.1.jar \
+  && wget --no-verbose https://selenium-release.storage.googleapis.com/3.10/selenium-server-standalone-3.10.0.jar \
     -O /opt/selenium/selenium-server-standalone.jar

Hub/generate_config

@@ -2,7 +2,6 @@
 
 cat <<_EOF
 {
-  "host": null,
   "port": $GRID_HUB_PORT,
   "role": "hub",
   "maxSession": $GRID_MAX_SESSION,