[webapi]Change ref test in tct-flexiblebox-css3-tests

- Add 2 reference files for 19 tests
- Still keep the 19 ref tests as manual because test tool haven't support ref type

Impacted tests(approved): new 0, update 19, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 19, fail 0, block 0
[wrt]update test.py to run on list devices

[Detailed commit message (if have)]
Impacted TCs num(approved): New: 131
Unit test platform: [tizen]
Unit test result summary: Pass 131 , Fail 0, Blocked 0
Merge pull request #706 from linshen/shenlin/manifest-auto

[wrt]update test.py to run on list devices
[usecase-webapi][XWALK-1473] Fix bug for WebRTC

- The onDataChannel can not be fired on the first channel inChrom, so avoid to use it

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Android]
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #704 from chenxix/chenxi/misc-uiautomation/css-flex

[webapi]Change ref test in tct-flexiblebox-css3-tests
Update atip activity name to new format.
Merge pull request #715 from yugang/yugang/atip-update-activity

Update atip activity name to new format.
Merge pull request #711 from yunxliu/yunxliu/misc/webrtc_fix

[usecase-webapi][XWALK-1473] Fix bug for WebRTC