Certify Redis and MongoDB installs

[steven-schattenberg-itential]

This contains two new steps: verify, and certify.

• Verify checks if a few requirements are met and prints out some facts.
• Certify gathers a few facts and runs a few tests, then writes a markdown file to /tmp. This markdown file is documentation friendly.

Both use a custom module that abstracts the gathering of generic facts in a reusable ansible task, like this:

- name: Gather host information
  itential.deployer.gather_host_information:
  register: host_info