Changing lock level from 5 to anything lower should release manual unlock capability

lockdown.feature

Given a thermostat connected to the ddk
When I set the local level to <lock level>
Then the lock icon is displayed
  and the setpoint cannot be changed
  and the keypad will/will not unlock device <keypad unlocks it>
Examples:
 |  lock level   |keypad unlocks it |
 |  4            | yes              |
 |  5            | no               |
 |  4            | yes              |