add option to manage net-tools package

[mcmartins]

I believe this is a controversial pull request.

net-tools is very common dependency, and in a huge code base with many dependencies most likely it will be already declared somewhere.

I've introduced a flag manage_net_tools in params.pp with a default true, which will keep working as it is for everyone, but will allow projects like ours to mark it as false when net-tools is already managed somewhere else.

Thanks.

Manuel

[kenyon]

Why does Splunk even need a package that's been obsolete/deprecated for like 20 years? 😞

[mcmartins]

My bad, I'll include some tests tomorrow. I'll update the documentation as well with a description for this flag.

[mcmartins]

Added some tests on enterprise_spec.rb and updated the REFERENCE.md

[bastelfreak]

thanks for the PR. I rebased it against our latest master to pull in the updated CI matrix.