[YARN-8923] Cleanup references to ENV file type in YARN service code

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.3.0
• Component/s: yarn-native-services
• Target Version/s: 3.3.0
• Assignee: Suma Shivaprasad
• Reporter: Suma Shivaprasad
• Created: 20/Oct/18 01:05
• Updated: 22/Oct/18 23:29
• Resolved: 22/Oct/18 22:41

Description

YARN Service code still has references to ENV file type which should be removed. And a few other unused methods in configuration file handling which could be removed