(PUP-1369) Package options property / ports provider

I've decided to split PR #2130 into smaller parts. This is one of them.

This PR implements enhanced 'ports' provider for package resource.

This code was originally developed as a separate puppet module
[ptomulik-packagex_portsx](https://github.com/ptomulik/puppet-packagex_portsx)
and you may find its documentation there.
Merge branch 'feature/ports' into ports_provider

Conflicts:
	lib/puppet/provider/package/ports.rb
	spec/unit/provider/package/ports_spec.rb