[segbot_logical_translator] should check whether costmap has been updated whether door/no-door version.

[piyushk]

Right now whenever segbot_logical_translator updates the map being used by navigation, it waits 1 second arbitrarily after publishing the map after which it assumes the map has been changed. This is bad for 2 reasons:

1. Under greater computational load where the map update process can take more than 1 second - ex. Some of the observations returned after approaching a door may be wrong as move_base may not have updated to the map where doors are not marked as obstacles.
2. The general case where the update is really quick (<< 1 second) - We wait unnecessarily after the action is complete.

A better way of doing so would be to read the map_load_time of the costmap (hoping that it is set to the time the actual map was loaded in).