Open Stack

Hi,
I'd like to request a feature exception for
https://review.openstack.org/#/c/529442/

I finally managed to test it, and the generated image with Ambari 2.4.2.0 can 
spawn clusters with both HDP 2.4 and HDP 2.3. There are some issues when Hive 
is involved, but I think that they are not regressions.

The feature (which it's pretty trivial in itself, but required a fair amount 
of testing) is pretty much isolated and it won't cause regressions on other 
components anyway.

Ciao
-- 
Luigi