Make usage of the new stop semantics to properly shutdown the plugin

[purbon]

Implements stop to return from run according to elastic/logstash#3210

Depends on elastic/logstash-devutils#32 and elastic/logstash#3812

Fixes #14

Depends on Stud::Task being properly setup to finish the task when requested (jordansissel/ruby-stud#26)

[jsvd]

doesn't run for me:

  1) LogStash::Inputs::Irc behaves like an interruptible input plugin #stop returns from run
     Failure/Error: expect(plugin_thread).to be_alive
       expected `#<Thread:0x72e34f77 dead>.alive?` to return true, got false
     Shared Example Group: "an interruptible input plugin" called from ./spec/inputs/irc_spec.rb:6
     # /Users/joaoduarte/projects/logstash-devutils/lib/logstash/devutils/rspec/shared_examples.rb:14:in `(root)'
     # /Users/joaoduarte/.rvm/gems/jruby-1.7.19/gems/rspec-wait-0.0.7/lib/rspec/wait.rb:46:in `(root)'

[purbon]

@jsvd yes! this happen with .22 Stud, but not with .21, working on make it pass again .

[jsvd]

#<NameError: uninitialized constant Stud::Task>
org/jruby/RubyModule.java:2726:in `const_missing'
/Users/joaoduarte/all_logstash_plugins/logstash-input-irc/lib/logstash/inputs/irc.rb:91:in `run'
/Users/joaoduarte/projects/logstash-devutils/lib/logstash/devutils/rspec/shared_examples.rb:11:in `(root)'

[purbon]

@jsvd yeah! just found it now, I guess I was getting stud .21 from logstash-core or anyother place, but not the .22 👍

[purbon]

@jsvd should work as expected now.

[jsvd]

LGTM, can you squash and merge?

[elasticsearch-bot]

Merged sucessfully into master!