[wrt]update wrt test suite name

Unit test platform: [tizen]
Unit test result summary: Auto suite pack to pure, manu suite pack to wgt
Fix for tct-extra-html5-tests/base64.html

[Problem] The following test cases from tct-extra-html5-tests/base64 fail
    - base64_atob_ab_cd
    - base64_atob_abcd_space
    - base64_atob_space_abcd
[Cause] Those test cases fails since  Chromium implements the newest
        standard of base64 feature but the test has not been updated yet.

[Solution] Apply latest changes of base64.html from
           http://w3c-test.org/html/webappapis/atob/base64.html

BUG=XWALK-2227
[misc-cordove] Improve cordova usecase description
[usecase-wrt] Update usecase framework for wrt-usecase-android-tests
[wrt] Update suite name in xml for wrt-rtcoremanu-android-tests
Merge pull request #630 from kangxu/kangxu/wrt/wrt-rtcoremanu-android-tests/updateSuiteName

[wrt][XWALK-2241] Update suite name in xml for wrt-rtcoremanu-android-tests
Merge pull request #624 from wanghongjuan/wanghongjuan/misc/cordova-improve

[misc-cordove] Improve cordova usecase description
[usecase-cordova] Remove redundant element from cordova usecase
Merge pull request #616 from jizydorczyk/XWALK-2227

Fix for tct-extra-html5-tests/base64.html
Merge pull request #606 from linshen/update-commandline

[wrt]update wrt test suite name
Merge pull request #613 from kangxu/kangxu/misc/wrt-usecase-android-tests/update

[usecase-wrt] Update usecase framework for wrt-usecase-android-tests
Merge pull request #636 from wanghongjuan/wanghongjuan/misc/usecase-cordova

[usecase-cordova] Remove redundant element from cordova usecase