[omnibus] use YAML.dump to serialize simple hashes to disk #1896
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Description
The data for this file resource's content is really a simple Ruby Hash built up from node attributes, not a node object itself. Instead of relying on the .to_yaml behavior previously patched onto Hash, use plain old Ruby YAML.dump with the Hash instead.
Resolves new "NoMethodError: undefined method 'to_yaml' for Hash" error when chefspec'ing.
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