Update 44 TCs for MediaRenderer

- Update 44 TCs for MediaRenderer
- Failure analysis: The statuschanged event and rendererlost event cannot be fired

Impacted tests(approved): new 0, update 44, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 37, fail 1, block 6
Merge pull request #725 from yunxliu/yunxliu/webapi/mediaRenderer_modify

Update 44 TCs for MediaRenderer