Release version 2.11.1

This release adds support for Hive2, Spark2, HDP 2.5.5, and HDP 2.6.1

• Add HDP 2.5.5.0 ( Issue: #328 )
• Update cookbook headers ( Issue: #329 )
• Support installing Slider ( Issue: #330 )
• Support Hive2 installation and configuration ( Issue: #331 )
• Support Spark 2.x (spark2) package ( Issue: #332 )
• Add HDP 2.6.1 ( Issue: #333 )