support deploy-mgmt-hub.sh for CentOS

[janvda]

Currently as is described in the README.md: the script deploy-mgmt-hub.sh is only supported for Ubuntu 18.x and macOS.
It would be nice to extend the support to CentOS so that I can deploy the all-in-1 Horizon Management Hub, Agent and CLI on my Intel NUC6CAYB running CentOS Stream 8.

[bmpotter]

@janvda interested in contributing a PR for this?

[janvda]

I can give it a shot and see how far I get.

[janvda]

I had a quick attempt.

There are 2 blocking things:

1. ubuntu is using different commands (apt-get) to install packages than CentOS (rpm)
2. The script is installing the horizon debian package (apt-get install -yqf $TMP_DIR/pkgs/horizon*.deb). So we need an rpm version of the horizon package for CentOS.

[bmpotter]

@janvda See https://github.com/open-horizon/anax/blob/master/agent-install/agent-install.sh for examples of the rpm commands

[Anitaachu]

@bmpotter @joewxboy I would love to take a swing at this issue

[joewxboy]

@janvda Are you still working on this issue? If not, can @Anitaachu give it a shot?

[janvda]

No, I am not working on it. @Anitaachu can certainly give it a shot.

[joewxboy]

OK, @Anitaachu let @bmpotter know if you have any questions.

[naphelps]

With RHEL ppc64le and Fedora 36+ support, this should be simple to add.