Description of problem:
It would be awesome if we could generate warning messages on openstack overcloud deploy which need to be acknowledged with a "yes/no" if users include critical parameters such as NetworkDeploymentActions in their templates. I can't think of other ones which are critical, but those which have a potential to break the stack and by default should not be set unless the user absolutely knows what they are doing. 

The reason is that some users may set this parameter do to a one-time operation, but afterwards do not reset it to default values, leading to potentially big problems later down the road.

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