Add comments to the vms table

[djberg96]

As of Rails 5 we can add comments to tables and columns within the database. This is useful for developers, both within RedHat and externally, to help develop for the application.

As per the Rails 5 documentation, "It's highly recommended to specify comments in migrations for applications with large databases as it helps people to understand data model and generate documentation."

To that end I've begun with the vms table, and documented as much as I could. However, I need your help to finish it. Anywhere that you see the text "[DEFINITION NEEDED]" means I either don't know or don't fully understand what the column does and need someone to fill in that information for me.

(Originally #64, but got the rebase completely botched somehow, so resubmitting).

[mwperina]

@borod108 @pkliczewski @masayag

[Fryguy]

@bdunne @agrare

[bdunne]

👍 I like the idea, I'd like to populate as many of the definitions as possible before merge.

[djberg96]

@agrare Switched "change" to "up" as per your suggestion.

@Fryguy @agrare @bdunne I think it's ready to go.

[miq-bot]

Checked commits https://github.com/djberg96/manageiq-schema/compare/a84adee85d06af18d688d937343e681c67498f50~...a12453748734f4ec4d19d82b45bf4f5290c27d86 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 🏆