Current bad behavior:
If a node in drain mode receives a stepdown command, the stepdown command returns ok:1 (success) but the node in drain mode does not step down. Instead, the node in drain mode finishes drain mode and then remains in state PRIMARY.
What should happen:
Upon receiving a stepdown command, a node in drain mode should interrupt drain mode, step down to SECONDARY, and return ok:1 to the stepdown command.