Have freebsd port use pkg info if the freebsd version is >= 10000017

The port package provider for FreeBSD was not checking if the freebsd version is version 10. This causes the provider to attempt to use 'pkg_info' instead of 'pkg info'. This PR should fix this bug.
all the providers use the same resource, so maybe leave it in the resource and call new_resource.supports_pkgng? from in the provider when you need it. @danielsdeleo ?