Destroy release branches, pipelines, and update winston (Puppet Server 6.0.5)

(Initial planned release date: 2019-07-16)

• Merge tag and version number twizzling up (from release branch to z series dev branch to master, as applicable).
• Delete release branch if created.
• Remove Jenkins pipelines for release branch if created.
• Update Winston and any relevant Confluence pages with any changes needed in the release process.