Reverted "Upgraded ZooKeeper from 3.3.4 to 3.3.6.".

This reverts commit eb1cd4a7c0ad4310f090d4f0643cf4059ac5246b.
Reverted "Added resource checks to slave recovery tests to ensure
resources are re-offered after restarts."

This reverts commit 400a88f9817bb102522b08b83dca400380ad8a9b.