Removes reference files from MFTF repo

[dobooth]

Description

This PR removes two files from the repo. They will be hosted in the devdocs repo instead to reduce complexity.
Check with Don before merging.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/verification tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)
• Changes to Framework doesn't have backward incompatible changes for tests or have related Pull Request with fixes to tests

[coveralls]

Coverage remained the same at 50.994% when pulling 309a1f2 on magento-devdocs:db_remove_refs into 3609f4f on magento:master.

[jilu1]

@dobooth
What's the reason to remove these references?

[dobooth]

Couple reasons: 1) These are really codebase references, rather than MFTF references, so devdocs is a better place for it. 2) The topics are in the MFTF repo but the data file and build logic is on devdocs. This change will keep all the files in devdocs and make the process more stable. There was a Git issue with the MFTF repo a couple weeks ago that broke the devdocs build system. This will help prevent that in the future.

[jilu1]

I see. Thanks for the information!