add S9CascadeOpacityAndColor test
override updateDisplayedColor and updateDisplayedOpacity method in Scale9Sprite class
Merge pull request #3155 from pktangyue/patch

issue #2406: Override updateDisplayedColor and updateDisplayedOpacity method in Scale9Sprite class.
Resolved issue: Color and Opacity of Scale9Sprite will not be changed when it's added to NodeRGBA and run with FadeIn/Out actions.