Reproduce twice calling.

Reproduce twice calling onExit().

Run ccp-test
Node: Scene -> Test push scene -> Replace scene -> Touch to pushScene (self) -> Touch to popToSceneStackLevel(2)

In console, you will see:
1 - onExit: this - 89793000, time - 58865
2 - onExit: this - 89551320, time - 58858
3 - onExit: this - 89211328, time - 58870
// Touch to popToSceneStackLevel(2)
3 - onExit: this - 89559664, time - 58872 <- first calling
3 - Cleanup: this - 89559664, time - 58872
3 - onExit: this - 89559664, time - 58872 <- second calling after cleanup

Do not merge this PR.