ENYO-466: Tooltips shouldn't receive mouse events, so now they don't.
When moving the cursor over a translucent-but-present part of the tooltip flag, the tooltip decorator would lose focus/spotlight, causing the tooltip to dismiss and later re-appear. Setting the Tooltip to not be able to receive mouse events makes much more sense, as tooltips by their very definition aren't interact-able.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Merge pull request #1761 from enyojs/ENYO-466-blakestephens

ENYO-466: Tooltips shouldn't receive mouse events, so now they don't.

Reviewed-By: Krishna Rangarajan (krishna.rangarajan@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)