Only expose port 4444 in the Hub container

The node images shouldn't be exposing the 4444 port since they don't even listen on that port. Part of #3
SeleniumHQ · Nov 19, 2014 · ea92463 · ea92463
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commit ea92463
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diff --git a/Base/Dockerfile b/Base/Dockerfile
@@ -31,5 +31,3 @@ RUN  mkdir -p /opt/selenium \
 RUN sudo useradd seluser --shell /bin/bash --create-home \
   && sudo usermod -a -G sudo seluser \
   && echo 'ALL ALL = (ALL) NOPASSWD: ALL' >> /etc/sudoers
-
-EXPOSE 4444
diff --git a/Hub/Dockerfile b/Hub/Dockerfile
@@ -1,6 +1,8 @@
 FROM selenium/base:2.44.0
 MAINTAINER Selenium <[email protected]>
 
+EXPOSE 4444
+
 USER seluser
 
 CMD java -jar /opt/selenium/selenium-server-standalone.jar -port 4444 -role hub