[webapi] Merge webapi-dlna-ivi-tests to webapi-dlna-xwalk-tests

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 37, fail 15, block 23
Merge pull request #499 from yunxliu/yunxliu/webapi/merge_dlna

[webapi] Merge webapi-dlna-ivi-tests to webapi-dlna-xwalk-tests