generate:entity:content missing "Revision" methods on template

[verasativa]

Looks like generate:entity:content is missing the "revision" methods on its template.

Steps to reproduce it:

1. Create a new virgin module with generate:module
2. Create a new generate:entity:content and be sure to make commands.generate.entity.content.questions.revisionable to yes.
3. You wont be able to install the module (trough module:install or web admin), because the revision methods are added to route, but no definition its found.

[GMartin-dev]

This could be covered by #3030 since it adds the RevisionLogInterface class.

[jmolivas]

PR merged