Work order history: Improve columns

* Remove wrong expand on some columns (only 'user_name' and 'what' will share
  the expand space)
* Remove time column and use only date with datetime.datetime data type.
* Add an extra column to show notes, but only show the first line and
  ellipsize it.

Change-Id: I7a9d84ae77db677f30b1d45b8fd56f5c69b0bbb4
Merge "Work order history: Improve columns"