Prune the Kernel#puts override i nspec_helper

Not sure why this was here, but it's adding stupid HTML into everything!

ruby-runtime/spec/spec_helper.rb

@@ -17,11 +17,6 @@ $:.unshift Pathname(__FILE__).dirname.join('../lib')
 require 'jenkins/plugin/runtime'
 require 'jenkins/plugin/proxies/proxy_helper'
 
-def puts(msg = nil)
-  require 'erb'
-  super ERB::Util.h(msg) + "<br/>"
-end
-
 module SpecHelper
   # Java does not support opening directory as a File: File.open(".")
   # So Dir.mktmpdir {} does not work on JRuby because it tries to delete directory