[SPARK-5493] [core] Add option to impersonate user.#4405

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vanzin wants to merge 7 commits intoapache:masterfrom

vanzin:SPARK-5493

Commits on Feb 5, 2015

[SPARK-5493] [core] Add option to impersonate user.
Marcelo Vanzin
committed

Commits on Feb 6, 2015

Merge branch 'master' into SPARK-5493
Marcelo Vanzin
committed

Commits on Feb 7, 2015

Merge branch 'master' into SPARK-5493
Marcelo Vanzin
committed
Fix usage string.
Marcelo Vanzin
committed

Commits on Feb 10, 2015

Review feedback.
Marcelo Vanzin
committed
Remove unneeded annotation.
Marcelo Vanzin
committed
Clarify the reason for the special exception handling.
Marcelo Vanzin
committed