Add flavor reservation configuration

[Mark-Powers]

This adds configuration needed for the blazar flavor plugin.

[Mark-Powers]

@msherman64 Is there a way I can assert a condition on the defaults? I want to ensure
enable_host_reservation nand enable_flavor_reservation

[msherman64]

@msherman64 Is there a way I can assert a condition on the defaults? I want to ensure enable_host_reservation nand enable_flavor_reservation

there's not really a way to do this within the defaults file / config file. You either need to do this in an ansible task (like in prechecks or config steps, in kolla-ansible), or via an external tool like ansible-lint. In chi-in-a-box itself, you're almost limited to the logic that jinja can do.

will blazar fail if both host_reservation and flavor_reservation are enabled?

[Mark-Powers]

Main issue is that our host_reservation code assumes a lot about hosts, and the monitoring fails for some reason. I'm still digging into this.

[codyhammock]

I think that it be more clear and consistent to name these labels with "blazar_", e.g. "blazar_enable_host_reservation".