This PR intends to update Apache HttpComponents dependencies to newer versions, but in reality we're using even older versions than were there before that PR.

I have attached a file called deptree.txt, which was generated with mvn dependency:tree on the 2.2.1.Final tag of the aerogear-unifiedpush-server repository. This is the tree for the ./servers/plain module, where the war file for our container image is built from.

grep httpcomponents deptree.txt

|  |  +- org.apache.httpcomponents:httpclient:jar:4.0.2:compile

|  |  |  +- org.apache.httpcomponents:httpcore:jar:4.0.1:compile

Thanks to Jozo Mrazek for noticing this!

CC: Summers Pittman, Daniel Passos