[RFE] Make OpenStack Support Configurable

[sadsfae]

Is your feature request related to a problem? Please describe.

Not all environments running QUADS (or adopting it) may care about OpenStack conveniences like the generation/maintenance of the instackenv.json file or additional move_and_rebuild_host.py Badfish activities like enforcing boot order.

Describe the solution you'd like

We should provide the following option in /opt/quads/conf/quads.yml

enable_openstack_features: false

If false then the following will be skipped:

1. generation of instackenv.json
2. running of badfish boot order enforcement for Dells or SUPPORTED (in config.py)

If true then everything remains the same.

The default should be false

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Additional context
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