Add plugin to report CPU usage
user
```ruby
require_plugin 'linux::cpu'

cpu[:all] = Mash.new

status, stdout, stderr = run_command(:no_status_check => true,
                                     :command => "mpstat -P ALL")

stdout.lines do |line|
  case line
  when /[0-9]*\.[0-9]{2}$/
    info = line.split("\s")
    cpu_num = info[1]
    cpu[cpu_num][:usr] = info[2]
    cpu[cpu_num][:nice] = info[3]
    cpu[cpu_num][:sys] = info[4]
    cpu[cpu_num][:iowait] = info[5]
    cpu[cpu_num][:irg] = info[6]
    cpu[cpu_num][:soft] = info[7]
    cpu[cpu_num][:steal] = info[8]
    cpu[cpu_num][:guest] = info[9]
    cpu[cpu_num][:idle] = info[10]
  end
end```
assistant