[webapi] Update 52 Tcs for nativefilesystem
- On android phone and tizen IVI support diffent dir lists. Cannot
  make sure which dir is supported on device, so test dirs one by one

Impacted tests(approved): new 0, update 52, delete 0
Unit test platform: [Android][Tizen IVI]
Unit test result summary: pass 52, fail 0, block 0
Merge pull request #384 from yunxliu/yunxliu/webapi/change_iap_dir

[webapi] Update 52 Tcs for nativefilesystem