button to clear the filter search

[Cindy Lu]

Enhancement:

In the filter search on each dashboard, if you want to clear it, you have to use keyboard strokes. It would be nice if the magnifying icon detected that the user started typing in the box and then changed into a clickable button that will empty out/reset the field.

Example:

if you go to: https://bugs.launchpad.net/horizon/ at the bottom there is a search field that as this behavior.