Fix host destroy double check logic

The check for whether a prompt should be provided
on host destroy had the logic reversed.  It should
only show up when --includedata is provided.  This
will now behave as expected.

Change-Id: Id90960ab4e2d4bbaf11ced8f484014766bf7668e

kolla_cli/commands/host.py

@@ -90,7 +90,7 @@ class HostDestroy(Command):
             if parsed_args.removeimages:
                 remove_images = True
 
-            if not include_data:
+            if include_data:
                 question = ('This will delete all containers and data'
                             ', are you sure? (y/n)')
                 answer = raw_input(question)