DP-709 Revert "Merge pull request #48 from VertiPub/YARN-1512-AsyncScheduling"

This reverts commit 6eccd940b1df2f0baa1c5f01991675696d5d422f, reversing
changes made to a566ad531003fada4fe4eb6efbd68c07d71bcda4.
Merge pull request #49 from VertiPub/aws-revert-YARN-1512

Aws revert yarn 1512