Release version 2.8.0

This release is a minor release, including support for configuring Hive logging and several bug fixes.

• Updates to testing configurations ( Issues: #301 #302 #304 )
• Update HDP versions when short versions given ( Issue: #303 )
• Support 2015 and 2016 Amazon Linux AMIs ( Issue: #305 )
• Use Java cookbook jdk.sh before BigTop tools ( Issues: #306 COOK-107 )
• Hive logging support ( Issues: #307 COOK-111 )
• Fix hadoop-mapreduce-historyserver stop ( Issue: #308 )