Converted plugins/freebsd/memory to Mixlib::ShellOut.
Convert plugins/freebsd/network to Mixlib::ShellOut.
Convert plugins/freebsd/platform to Mixlib::ShellOut.
Converted plugins/freebsd/uptime to Mixlib::ShellOut.
Converted plugins/freebsd/hostname to Mixlib::ShellOut.
Convert plugins/freebsd/virtualization to Mixlib::ShellOut.