[webapi] 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 34, fail 4, block 6
Merge pull request #684 from yunxliu/yunxliu/webapi/mediaRenderer_update

[webapi] Update 44 TCs for MediaRenderer