[CARBONDATA-1786] [BugFix] Refactored code to avoid null pointer exception while data loading

[geetikagupta16]

Refactored code to add hadoop conf to AbstractDFS file constructor

[CarbonDataQA]

Build Success with Spark 2.1.0, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder1/1333/

[ravipesala]

SDV Build Fail , Please check CI http://144.76.159.231:8080/job/ApacheSDVTests/1791/

[geetikagupta16]

retest this please

[CarbonDataQA]

Build Success with Spark 2.1.0, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder1/1336/

[geetikagupta16]

@ravipesala Please review. This PR will resolve the current NullPointer exception for data loading. SDV test cases are failing due to the same issue.

[ravipesala]

@jackylk @QiangCai Please check this PR. It seems PR #1539 makes lot of SDV test fails. Now current master fails in SDV because of this PR 1539 is merged

[CarbonDataQA]

Build Success with Spark 2.1.0, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder1/1357/

[ravipesala]

SDV Build Success , Please check CI http://144.76.159.231:8080/job/ApacheSDVTests/1811/

[ravipesala]

PR 1550 fixed it, please close it.

[ravipesala]

SDV Build Success , Please check CI http://144.76.159.231:8080/job/ApacheSDVTests/1817/

[CarbonDataQA]

Build Success with Spark 2.1.0, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder1/1367/

[chenliang613]

@geetikagupta16 thanks for your contribution, pr1550 already fixed this issue and merged, please close this PR.