[webapi] Add 18 TCs for DLNA MediaServer interface

 Impacted TCs num: New 18, Update 5, Delete 0
 Unit test Platform: Tizen
 Tizen test result summary: Pass 19, Fail 4, Block 0

Fail reason:
  1. Follow the spec, the canCreateContainer and canUpload should be "boolean" but got "string"
  2. Follow the spec, the modelDescription and presentationURL should be "string" but got "object"