title: How to make all my routes in camel go async?
body: <p>So we have a camel app that for the moment was ok. It has many routes that form a huge tree. 
  Then we received the requirement to go in parallel for certain messages. Problem is that although it is easy to parallelize one route (using <code>.threads()</code>  or <code>.parallelProcessing()</code> after a splitter) it may happen that two different threads will send msgs to the same route (that doesn't run in parallel) and thus block. 
  Now I'd like to avoid going through all the application and modify all routes to be multithreaded (even because that could possibly break the behaviour of the app).</p>
  
  <p>Any solution you can think of?</p>