[LIVY-374] Change and unify Livy code license header to Apache

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.4.0
• Component/s: API, Batch, Core, Docs, Interpreter, REPL, RSC, Server, Tests
• Assignee: Saisai Shao
• Reporter: Saisai Shao
• Created: 30/Jun/17 08:43
• Updated: 04/Jul/17 09:30
• Resolved: 04/Jul/17 09:30