Add list of types of logs to tempest-logs page

Just by looking at the log names, its hard to decipher what they
actually are. Add a table to make this a little easier to understand.
This is the first pass at such table and is non-exhaustive.

Co-Authored-By: Matthew Treinish <mtreinish@kortar.org>
Change-Id: If355a59d5df70e646043e669f18c5cc0ad59602d
Merge "Add list of types of logs to tempest-logs page"