title: TCP Connection Failure issues in latest bunny version (2.0.0)
body: <p>I'm trying out the Bunny amqp client gem version 2.0.0. And while I was trying I found the following error :</p>
  
  <p>W, [2015-08-03T07:36:21.913706 #9100]  WARN -- #: Could not establish TCP connection to 10.223.19.94:5672: 
  /usr/local/rvm/gems/ruby-1.9.2-p320/gems/bunny-2.0.0/lib/bunny/session.rb:298:in <code>rescue in start': Could not establish TCP connection to any of the configured hosts (Bunny::TCPConnectionFailedForAllHosts)
      from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/bunny-2.0.0/lib/bunny/session.rb:264:in</code>start'
      from rabbit-client-test.rb:12:in <code>&lt;main&gt;</code></p>
  
  <p>Also, I noticed that the same error does not occur in the previous version of bunny 1.7.0. Is it something related to gem? </p>