Comment 5 for bug 1483321

@Markus
I remembered I saw somewhere about how to upgrade, (step by step in updating from J to K or others)
I think it's best and suitable way to use this kind of 'different version' talking to make compute host alive
during system upgrade.

so I believe controller should be upgrade first the compute node to be update set by set
that means Kilo conductor should works with Juno compute
but on the contrary I didn't see a value for supporting it ...