fix hostname in output

[bmx0r]

Pull Request Checklist

Is this in reference to an existing issue?
no

General

• Update Changelog following the conventions laid out here

• Update README with any necessary configuration snippets

• Binstubs are created if needed

• RuboCop passes

• Existing tests pass

New Plugins

• Tests

• Add the plugin to the README

• Does it have a complete header as outlined here

Purpose

• When using the script with -h 127.0.0.1 we end up with 127 as hostname, I change to have a hostname more graphite compliant
• include MR Collect more innodb variables #111: Collect more innodb variables Collect more innodb variables #111
• include metrics gathering from https://github.com/sensu-plugins/sensu-plugins-percona in metrics-mysql-graphite.rb (there is no reason to run the gathering twice and no reasons to keep two code base)

Known Compatibility Issues