Deprecation: Sigar gem based plugins removal (OHAI-2)

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When Ohai was first released it depended on the sigar gem for discovering system configuration details. As time went on Ohai was expanded with built-in discovery methods for various platforms. The sigar gem was still required by Ohai and used primarily for the HP-UX platform. The SIGAR project is no longer active, and there is no longer an active port of Ruby to HP-UX. Due to this we’ve chosen to remove the sigar dependency and all sigar-based plugins from Ohai 13. There is no anticipated impact for Chef Foundation Platforms or Secondary Platforms. See the Platforms page for a complete list of platforms.