Update Cobbler client to 0.5.x release

[SchoolGuy]

Is your feature request related to a problem?

As a user
I want to utilize the Terraform Provider with the latest releases of Cobbler
so that I can keep my infrastructure updated.

Provide a detailed description of the proposed feature

The newer Cobbler 3.3.x releases contain a lot of performance enhancements that users want to take care of, as such the Terraform provider should be updated to accommodate to this.

Alternatives you've considered

None

Additional information

• This will require breaking changes as the Client inherited them from the API.
• This update will allow setting fields that are of type list or map to inherit via attribute_inherit = true. Setting this will conflict with the attribute.

[SchoolGuy]

Progress is good at the moment locally. The provider builds again after the update to 0.5.2. I am trying to satisfy the tests at the moment. I will open a WIP PR then. After that I will introduce the attribute_inherit attributes.