[usecase-wrt]move usecase to separate folder

[Detailed commit message (if have)]
Impacted TCs num(approved): move all usecase to separate folder
Unit test platform: [android]
Unit test result summary: Pack to apk and isntall to verify the page showing ok
[wrt] Rename folder and update tcs for wrt extension
Merge pull request #518 from linshen/update-usecase-android

[usecase-wrt]move usecase to separate folder
Merge pull request #517 from kangxu/kangxu/wrt/wrt-extension-android-tests/update

[wrt] Rename folder and update tcs for wrt extension
[wrt]update config.xml change the id format for wgt install

[Detailed commit message]
Impacted TCs num(approved): New 0, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 0, Fail 0, Blocked 0
Merge pull request #519 from linshen/modify-wrt-i18n-tizen-test

[wrt]update config.xml change the id format for wgt install