BHV-11000: Make both src and sourceComponents in moon.VideoPlayer works

This fix is dependent on https://github.com/enyojs/enyo/pull/794

- Modify videoPlayer to support sources array to set multiple sources.
- Modify samples to use sources instead of src in VideoPlayer.

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
rename _srcChanged and fixed incorrect video urls
Merge pull request #1445 from branch BHV-11000-kunmyonchoi