Add setting to discern baremetal sites

[super-cooper]

This change introduces a new configuration parameter which allows sites to distinguish themselves as baremetal. This allows for distinct configuration between baremetal and other sites.

[super-cooper]

Horizon - Remove unused tabs

[msherman64]

In some sense this is already defined by whether ironic is enabled: https://github.com/ChameleonCloud/chi-in-a-box/blob/c12d27e0711735519371230a373bb4370bcb3a0c/kolla/defaults.yml#L160

Hypothetically in the future, we would like to allow 'hybrid' sites, that enable both KVM and baremetal, so making this granular would be handy.