[RHDM-864] Upgrade RHDM cloud images to 7.4.0

[errantepiphany]

[RHDM-864] Upgrade RHDM cloud images to 7.4.0
https://issues.jboss.org/browse/RHDM-864

Signed-off-by: David Ward dward@redhat.com

Thanks for submitting your Pull Request!

Please make sure your PR meets the following requirements:

• Pull Request title is properly formatted: [RHDM-XYZ] Subject
• Pull Request contains link to the JIRA issue
• Pull Request contains description of the issue
• Pull Request does not include fixes for issues other than the main ticket
• Attached commits represent units of work and are properly formatted
• You have read and agreed to the Developer Certificate of Origin (DCO) (see CONTRIBUTING.md)
• Every commit contains Signed-off-by: Your Name <yourname@example.com> - use git commit -s