WIP: Add more hostinfo plugins

This is a work-in-progress on adding more hostinfo plugins, but I am submitting the PR now to get comments/feedback and exposure.
This comes from the `goto` line [here](https://github.com/virgo-agent-toolkit/rackspace-monitoring-agent/pull/644/files#diff-05c4d1b4dfd787fbc45f2acc1a907ec8R80) and is used to skip the first two header lines. I know @ziadsawalha wasn't crazy about using a `goto` statement in 2014, but we didn't see a better way to do it. :smile: