Make templates more DRY about packer-build HOT 6 CLOSED

The link above seems to suggest that this feature requires a parser capable of handling YAML 1.2, however, YAML 1.1 seems to also have node anchors too (http://www.yaml.org/spec/1.1/#id899912).

Unfortunately, there are a lot more YAML 1.1 parsers out there.

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It would appear that, if hashicorp/packer#2692 were to be merged, this might also remove some/all of the need to do this too.

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Other background at hashicorp/packer#1942

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hashicorp/packer#2101.

Perhaps touching the passwords in the vagrant template files and preseed files during the "pre-packer phase" of the build would be nice.

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Maybe use https://github.com/jbeder/yaml-cpp or https://github.com/go-yaml/yaml.

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These changes will land at the same time that #4 does.

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