[usecase-webapi][XWALK-1419] Add a usecase for Telephony

- Add a usecase for Telephony
- Failure analysis: Feature issue, successcallback of dial function cannot be invoked

Impacted tests(approved): new 1, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 1, block 0