[webapi][XWALK-2572] Fix bug for mediaserver

- Fix bug for mediaserver
- Failure analysis: https://crosswalk-project.org/jira/browse/XWALK-1699

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 1, block 0
[webapi][XWALK-2593] Fix bug for webrtc

- Fix bug for webrtc
- Failure analysis: https://crosswalk-project.org/jira/browse/XWALK-2593

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

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 9, deleted 1
Unit test platform: [tizen]
UT result: Pass 9, Fail 0,Block 0
[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
Merge pull request #1017 from yunxliu/yunxliu/misc/telephony

[usecase-webapi][XWALK-1419] Add a usecase for Telephony
Merge pull request #1056 from linshen/shenlin/update-commandmanu-bywang

[wrt]update multiuser tcs
Merge pull request #953 from yunxliu/yunxliu/webapi/webrtc_xwalk2593

[webapi][XWALK-2593] Fix bug for webrtc
Merge pull request #961 from yunxliu/yunxliu/webapi/mediaserver_xwalk2572

[webapi][XWALK-2572] Fix bug for mediaserver