Evenscripts: improvements to ctdb_service_check_reconfigure().

Evenscripts: improvements to ctdb_service_check_reconfigure().

* Make this function applicable to "ipreallocated" event too.

* Monitor event should not always succeed just because we reconfigure.

  If the service was unhealthy before the reconfigure and we end the
  reconfigure with "exit 0" then we can cause the node's health status
  to flip-flop.

  To avoid this we return the status of the service from the previous
  monitor event.

Signed-off-by: Martin Schwenke <martin@meltin.net>