SPARK-1652: Remove incorrect deprecation warning in spark-submit

This is a straightforward fix.

Author: Patrick Wendell <pwendell@gmail.com>

This patch had conflicts when merged, resolved by
Committer: Patrick Wendell <pwendell@gmail.com>

Closes #578 from pwendell/spark-submit-yarn and squashes the following commits:

96027c7 [Patrick Wendell] Test fixes
b5be173 [Patrick Wendell] Review feedback
4ac9cac [Patrick Wendell] SPARK-1652: spark-submit for yarn prints warnings even though calling as expected