Include hosts inside private subnets when they have dns names

We frequently connect to these hosts through an ssh tunnel to the bastion box. This will enable us to do stuff like manage users on these boxes that are buried within the VPC.

Change-Id: I6121585bafc7ae661e66060eeefdd472edcacbb2

share/ec2.py

@@ -331,6 +331,7 @@ class Ec2Inventory(object):
         for dest_variable in [self.destination_variable, self.backup_destination_variable]:
             if hasattr(instance, dest_variable):
                 dest = getattr(instance, dest_variable)
+                break
 
         if not dest:
             # Skip instances we cannot address (e.g. private VPC subnet)