Convert some existing templates to YAML format.

Convert some existing templates to YAML format.

This is the result of running:
python tools/cfn-json2yaml templates/
and then cleaning up by hand to be more consistant, readable and
maintainable.

The following templates are enforced to parse to identical stacks
in the unit tests so any fundamental change to one must be made
to the other.

Quantum.template
Quantum.yaml

WordPress_Single_Instance.template
WordPress_Single_Instance.yaml

Change-Id: Ibe05a5c5a7a5bb1861c5f84a3dc41e2d632852fd