title: Reference is null when child in another bundle
body: <p>I have folowing classses</p>
  
  <p>abstarct class:</p>
  
  <pre><code>@Component(componentAbstract = true)
  public abstract class A implements SomeInterface{ 
      @Reference
      private ConfigurationManager manager;
      @Activate
      protected void activate(ComponentContext componentContext) {
         manager.getTimeout();
      }
  }
  </code></pre>
  
  <p>first child:</p>
  
  <pre><code> @Component(
              enabled = true,
              immediate = true,
              inherit = true,
              metatype = true,
              label = "***",
              description = "***"
      )
      public class A1 extends A {...}
  </code></pre>
  
  <p>second child:</p>
  
  <pre><code>@Component(
          enabled = true,
          immediate = true,
          inherit = true,
          metatype = true,
          label = "********",
          description = "*************"
  )
  public class A2 extends A {...}
  </code></pre>
  
  <p><code>A</code> and <code>A1</code>  resides in same bundle but <code>A2</code> in another.</p>
  
  <p>when <code>Apache Felix</code> instantiate <code>A1</code> <code>manager.getTimeout();</code> row executes successfully but for <code>A2</code> this row is cause of <code>NullPointeException</code>.</p>
  
  <p>How to solve this problem?</p>
  
  <p><strong>update:</strong></p>
  
  <pre><code>@Component(
          enabled = true,
          immediate = true,
          metatype = true,
          label = "***"
  )
  @Service(ConfigurationManager.class)
  public class ConfigurationManager {
  @Activate
      protected void activate(ComponentContext componentContext) {
          valueDelimiter = PropertiesUtil.toString(componentContext.getProperties().get(PROPERTY_VALUE_DELIMITER), PROPERTY_VALUE_DELIMITER_DEFAULT);
          valueDelimiter = Pattern.quote(StringEscapeUtils.unescapeJava(valueDelimiter));//read value from osgi config
          ...
  
          LOG.info("Service reconfigured: {}", toString());
      }
  
  }
  </code></pre>