moved to Mixlib::ShellOut wrapper
Made wrapper a module_function.
Converted plugins/c_spec to Mixlib::ShellOut.
Converted plugins/erlang_spec to Mixlib::ShellOut.
Converted plugins/groovy_spec to Mixlib::ShellOut.
Converted plugins/darwin/cpu to Mixlib::ShellOut.
Converted plugins/darwin/filesystem to Mixlib::ShellOut.
Converted plugins/darwin/hostname to Mixlib::ShellOut.
Converted plugins/darwin/kernel to Mixlib::ShellOut.