[branch-1.5][SPARK-11821] Propagate Kerberos keytab for all environments#9837

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Commits on Nov 19, 2015

[SPARK-11821] Propagate Kerberos keytab for all environments (not only YARN)
woj-i
committed
[SPARK-11821] change authentication method from simple to kerberos in case of Kerberos mode
woj-i
committed