Step down nominate command does not work

[rhysmeister]

./mm --step_down_nominate_host rhysmacbook.local --step_down_nominate_port 30001

Return code 1, no output or action

[rhysmeister]

Missing flag...

./mm --step_down_nominate_host rhysmacbook.local --step_down_nominate_port 30001 --step_down rs0

Perhaps add check for this?

[rhysmeister]

Added a simple check for this so --step_down must be specified whenever the nominate options are used.