[GitHub] drill issue #944: DRILL-5425: Support HTTP Kerberos auth using SPNEGO

[sohami]

Github user sohami commented on the issue:

    https://github.com/apache/drill/pull/944
  
    Created a separate PR for this JIRA: 
https://github.com/apache/drill/pull/1040
    1) I have kept the initial commit with the new PR and added new changes as 
separate commit.
    2) Changes include refactoring of the code, added new tests and fixes done 
for the issues.


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