[usercase-wrt] update mutiuser testcase to designed

[Detailed commit message (if have)]
Impacted TCs num(designed): New 0, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary: only update tests.xml
Merge pull request #890 from linshen/shenlin/wrt-usecase-move-multiuser

[usercase-wrt] update mutiuser testcase to designed
[wrt][XWALK-1649]Add multiuser tcs for wrt-commandlinemanu-tizen-tests

[Detailed commit message (if have)]
Impacted TCs num(designed): New 6, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 6, fail 0, block 0
Merge pull request #878 from linshen/shenlin/wrt/multiuser-xwalk1649

[wrt][XWALK-1649]Add multiuser tcs for wrt-commandlinemanu-tizen-tests
[usecase-wrt]update tests.tizen.xml to tests.xml

[Detailed commit message (if have)]
Impacted TCs num(designed): New 0, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary:update tests.tizen.xml
[wrt] Update manifest files

Impacted TCs num(approved): New 0, Update 5, Delete 0
Unit test Platform: Android
Android test result summary: Pass 5, Fail 0, Block 0
Merge pull request #892 from linshen/shenlin/update-usecase-tests.xml

[usecase-wrt]update tests.tizen.xml to tests.xml
Merge pull request #893 from wanghongjuan/wanghongjuan/rtcoremanu/manifest

[wrt] Update manifest files