Per-installation hook_tool / side by side installation.

[danfulton]

Installing the python wheel allows testing newer versions of podman-hpc easily, however the newly installed version is not fully independent and uses the centrally installed hook_tool. Ideally these installations would be completely independent, and the hook tool could also be tested without RPM install.

I think the right way to do this is to save write all settings and paths into the python lib siteconfig directory, rather than hard coding them into the siteconfig.py file. We could then have a get/set interface to change per installation.

This can interact with/be used by the podman-hpc info subcommand.