Merge pull request #1751 from szok/hostname-bo-export

Add hostname to ng export

src/ralph/export_to_ng/resources.py

@@ -118,7 +118,7 @@ def dehydrate_owner(self, asset):
 
     def dehydrate_hostname(self, asset):
         try:
-            hostname = asset.device_info.ralph_device.name or ''
+            hostname = asset.hostname or ''
         except AttributeError:
             hostname = ''
         return hostname