This is a follow-up change to [0] which further implements data objects
to be used in the generation of documents in Jinja2. The following
additions and changes are made:
- Adds helper functions to data objects to filter hosts and networks for
ease of use in Jinja2 templates
- Adds SiteDocumentData factory function to convert intermediary yaml
dictionaries into a SiteDocumentData object with all associated objects
- Updates Jinja2 templates to use data objects
- Cleans up overly complex looping in Jinja2
- Adds tests for new code in models.py
[0] https://review.opendev.org/#/c/662092/
Change-Id: I66ebfeaf5d6ca76b6dee5a2285a74bad8b06b720
Ian H. Pittwood