[webapi] Update sign-flag position in suite.json

Signed-off-by: Hao yunfeix <yunfeix.hao@intel.com>
Merge pull request #773 from haoyunfeix/yunfei/update-webapi-sign-flag

[webapi] Update sign-flag position in suite.json
[usecase-cordova] Rename cordova-usecase-android-tests to cordova-usecase-tests

- Fail Reason: XWALK-2288, XWALK-2275

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Android]
Unit test result summary: pass 5, fail 2, block 0
Merge pull request #775 from haoxli/haoxli/usecase-cordova/rename

[usecase-cordova] Rename cordova-usecase-android-tests to cordova-usecase-tests