TaskCat Config Generator

[tbulding]

Overview

This change adds the ability to generate the .taskcat.yml config file based on a CloudFormation template. The tool can generate the configuration file with verbose information (-v) about the parameters.(This information is taken from the CFN)
The tool also offers the option to generate a .taskcat_overrides.yml file (-c). The tool attempts to populate empty values based on the parameter name.

Testing/Steps taken to ensure quality

How did you validate the changes in this PR?
I ran the tool against a 15 different Quick Start projects.

Notes

Optional. Caveats, Alternatives, Other relevant information.

Testing Instructions

To test this PR you will need to install Taskcat From the Originating fork. Clone the Forked repo, and from the root of the repo run:
python setup.py install
Once taskcat is installed you can run it against an existing template with:

taskcat generate-tc-config -m templates/your_template.template.yaml -c

[andrew-glenn]

Generally, a well intended review and I 💯 appreciate the thought and effort. I think this will need a few iterations before it's ready to merge. Feel free to reach out internally to discuss.

[jaymccon]

looking good in general. A few asks:

• rename command to generate-config having the tc in there is redundant, and tc is not a commonly seen shortening for taskcat
• add unit tests to get to at least 80% coverage. I'd specifically like to see tests that check for safety of existing config files with this feature. Test should ensure that if a project/global config already exists and this command is run, that the existing files are not overritten and that the command exit's with an error
• run pre-commit run --all-files, fix any issues it raises, and provide the output as a comment on the pr. We used to do this automatically on PR's but haven't gotten around to re-implementing it since we stopped using travis. You may need to setup some tools locally before precommit will work, have a look at the travis config to get an idea of what is needed.