[YARN-6764] Simplify the logic in FairScheduler#attemptScheduling

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Affects Version/s: 2.8.1, 3.0.0-alpha3
• Fix Version/s: 2.9.0, 3.0.0-beta1
• Component/s: fairscheduler
• Assignee: Yufei Gu
• Reporter: Yufei Gu
• Created: 05/Jul/17 18:56
• Updated: 31/Aug/17 22:00
• Resolved: 09/Jul/17 23:15