Fedora 34 and iptables-compat fix; properly utilising iptables param.

[adamboutcher]

Improvement on PR - #1016 (#1016 (comment))
See BUG - https://tickets.puppetlabs.com/browse/MODULES-11147

This minor change to the package to use the name field and param should also mean supporting other distros/package names be much easier, where as prior it was static.

Completely untested on Debian Distros; Tested on CentOS7, Fedora 33, Fedora 34. Can't forsee any issues.

[puppet-community-rangefinder]

firewall::linux is a class

that may have no external impact to Forge modules.

firewall::params is a class

that may have no external impact to Forge modules.

This module is declared in 106 of 578 indexed public Puppetfiles.

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[CLAassistant]

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[adrianiurca]

Seems something not working properly because almost all tests are failing

[adamboutcher]

Ah, I think I can see why, it seems $package_name is used differently to how I expected...

[adamboutcher]

Hopefully those changes should improve things. Apologies, I've not got enough infrastructure to personally test this and the previous changes worked on Fedora 34.

[adamboutcher]

As well as fixing the Fedora 34 issue, this PR moves the iptables package name into params called iptables_name, it should allow the package names to be more separate from the installation code.