Misc updates for CentOS Stream 9 hosts

[bdunne]

• Document dependencies
• Ensure boot device is hd
• Switch graphics to VNC for those not on linux
• Prefer .local rather than .xip.io

[miq-bot]

Checked commit https://github.com/bdunne/manageiq-appliance-build/commit/9f0bbeff2ba74161d3e3ec5f0daad4423b0ff336 with ruby 2.7.8, rubocop 1.56.3, haml-lint 0.51.0, and yamllint 0 files checked, 0 offenses detected Everything looks fine. :cake: