Linux distro: Support for RHEL 8.7 and RHEL 9.1

[johnwalicki]

Open a issue in the Anax repo to update the agent_install.sh with the new Linux distro release version.

#3560

Open a issue in the Examples repo to validate the examples on this new Linux distro release.

open-horizon/examples#568

Open a issue in the Documentation repo to update the docs for this new Linux distro release.

open-horizon/open-horizon.github.io#355

New Linux Distro Support Checklist

• Add new Linux distro release agent_install.sh
• Validate Examples on this new Linux distro release
• Documentation updates to support this new Linux distro release
• Test / Validate and modify existing tests for the x86_64 anax binary for this new Linux distro release

[johnwalicki]

All of these sub-issues have been resolved with PR improvements. Closing this master issue. RHEL 8.7 and 9.1 are now supported.