title: Retrieve all properties in CamelContext
body: <p>I'm writing a bean that extends <code>LifecycleStrategy</code> and during </p>
  
  <pre><code>onContextStart(CamelContext context) 
  </code></pre>
  
  <p>I need to retrieve all the properties that have been loaded in the context. If I call <code>context.getProperties()</code> it returns a map with lenght = 0 (it seams that no properties are loaded) but if i call <code>resolvePropertyPlaceholders("{{one.of.my.properties}}")</code> it resolves correctly.. There is any way to retrieve all the properties key?</p>
  
  <p>ps. my properties are loaded via propertyPlaceholder in camelContext</p>