Add metrics-numastat.rb

[maoe]

Pull Request Checklist

Is this in reference to an existing issue?

General

• [x] Update Changelog following the conventions laid out on Keep A Changelog
• [x] Update README with any necessary configuration snippets
• [x] Binstubs are created if needed
• [x] RuboCop passes
• [x] Existing tests pass

  New Plugins

• [x] Tests
• [x] Add the plugin to the README
• [x] Does it have a complete header as outlined here

  Purpose

This plugin is a wrapper around the numastat command.

% /opt/sensu/embedded/bin/ruby ./metrics-numastat.rb -s numastat
numastat.node0.numa_hit 70109703 1459233325
numastat.node1.numa_hit 71051265 1459233325
numastat.node0.numa_miss 0 1459233325
numastat.node1.numa_miss 0 1459233325
numastat.node0.numa_foreign 0 1459233325
numastat.node1.numa_foreign 0 1459233325
numastat.node0.interleave_hit 21142 1459233325
numastat.node1.interleave_hit 22049 1459233325
numastat.node0.local_node 70101065 1459233325
numastat.node1.local_node 71037602 1459233325
numastat.node0.other_node 8638 1459233325
numastat.node1.other_node 13663 1459233325

Known Compatablity Issues

I've tested this on Ubuntu Trusty. No known issues so far.

[maoe]

Thanks for quick turnaround. Would you mind releasing a new version?