Prepare Major version update

[alvagante]

Module needs some updates.
In the major release the following changes are expected:

• Future parser code
• Deprecation of several general params hardly used. (prerequisite: Add deprecation notice for parameters that will be dropped in the major release #228)
• FIx hostname on RedHat (Improve sysconfig/network logic on RHEL #84)
• Evaluate params refactoring of the main module defines

[alvagante]

Pushed to https://github.com/alvagante/puppet-network4 preliminary works for new version of the module. That is a temporary repo, when upgrading to version 4 a complete erase & copy of all the repo files will be done on master here and network4 will be removed.

I definitively need feedback on how backwards compatibility is managed in (ie: by default disabled, but configurable with legacy options).
Will later start to work on new implementations of network::interface and route defines.
Ping @igarny @TorLdre @tuxmea @denzs @johnwarburton @yasa1987 @luitzifa @maxadamo

[yasa1987]

I just noticed that Ubuntu is not using ifupdown anymore in favor of Netplan. As I need an Ubuntu server for a specific tool, I'll try to integrate that in the network module.