Unit test broken

[Pere Urbón]

See: http://build-eu-00.elastic.co/view/LS%20Plugins/view/LS%20Inputs/job/logstash-plugin-input-s3-unit/jdk=JDK7,nodes=metal-pool/18/console

Using rspec 3.1.0
Using rspec-wait 0.0.8
Using logstash-devutils 0.0.18
Using logstash-mixin-aws 2.0.2
Using logstash-input-s3 1.0.0 from source at .
Using bundler 1.10.6
Bundle complete! 5 Gemfile dependencies, 57 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.
RuntimeError: Logstash expects concurrent-ruby version 0.9.1 and version 0.9.2 is installed, please verify this patch: /mnt/jenkins/rbenv/versions/jruby-1.7.20/lib/ruby/gems/shared/gems/logstash-core-2.0.0.snapshot5-java/lib/logstash/patches/silence_concurrent_ruby_warning.rb
           (root) at /mnt/jenkins/rbenv/versions/jruby-1.7.20/lib/ruby/gems/shared/gems/logstash-core-2.0.0.snapshot5-java/lib/logstash/patches/silence_concurrent_ruby_warning.rb:53
          require at org/jruby/RubyKernel.java:1072
           (root) at /mnt/jenkins/rbenv/versions/jruby-1.7.20/lib/ruby/gems/shared/gems/logstash-core-2.0.0.snapshot5-java/lib/logstash/patches.rb:1
          require at org/jruby/

[Pier-Hugues Pellerin]

fixed