- If the dhclient were to receive a DHCPNAK while it was in the RENEW

- If the dhclient were to receive a DHCPNAK while it was in the RENEW
  state (and consequently, had an active, 'bound' address and related
  configuration options), it would fail to 'tear down' this information
  before proceeding into INIT state.  dhclient now iterates the dhclient-
  script with the 'EXPIRE' action to cause these teardowns prior to entering
  INIT state. [ISC-Bugs #16035]