[XWALK-2431] Add use cases for rebasing to Chromium 38
[webapi-usecase] Add pluggable step for 48 usecase and remove 28 usecase

- Add pluggable step info for 48 usecase
- Remove 28 usecase beacuase of repeating with demo-express

Impacted tests(approved): new 0, update 48, delete 28
Unit test platform: [IVI]
Unit test result summary: pass 48, fail 0, block 0
[webapi-usecase] Remove 28 usecase items in tests xml files

- Remove usecase items in tests.full.xml, tests.android.xml and tests.tizen.xml
Merge pull request #958 from xinliux/xinliux/usecase/stepinfo

[webapi-usecase] Add pluggable step for 48 usecase and remove 28 usecase
[misc]update xwalkctl to pkgcmd

Impacted TCs num(approved): New 0, update 4, deleted 0
Unit test platform: [tizen]
UT result: Pass:4, Fail 0, block 0
Merge pull request #968 from linshen/shenlin/misc/updatexwalkctl

[misc]update xwalkctl to pkgcmd
[usecase-webapi] Update set name and sort the tests
[wrt][WEBQA-152] Fix packertool and manifest automation issue
Merge pull request #969 from kangxu/kangxu/WEBQA-152/fixIssue

[wrt][WEBQA-152] Fix packertool and manifest automation issue
[behavior] Get rid of packaging scripts in Shell

See issue #868 for details.
[cordova] Get rid of packaging scripts in Shell

See issue #868 for details.
[webapi] Get rid of packaging scripts in Shell

See issue #868 for details.
[usecase] Get rid of packaging scripts in Shell

See issue #868 for details.
[wrt] Get rid of packaging scripts in Shell

Exception:
- wrt-digitalsign-tizen-tests

See issue #868 for details.
[misc] Get rid of packaging scripts in Shell

Exception:
- webapi-noneservice-tests
- webapi-service-docroot-tests
- webapi-service-tests
- wrt-stablonglast2D-android-tests
- wrt-stablonglast2D-tizen-tests
- wrt-stablonglast3D-android-tests
- wrt-stablonglast3D-tizen-tests

See issue #868 for details.
[XWALK-1293] Remove a removeStorageStateChangeListener test of fileSystemManager

-Can not change storage state by JS
-The storageStateChange event can not be fired

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Merge pull request #966 from xiaojunwu/xiaojunwu/filesystem-removeStroageStateChangeListener

[XWALK-1293] Remove a removeStorageStateChangeListener test of fileSyste...
Merge pull request #956 from yunxiaoxie/yunxiaoxie/xwalksystem

[XWALK-2431] Add use cases for rebasing to Chromium 38
Merge pull request #973 from Honry/Honry/usecase/update-set-name

[usecase-webapi] Update set name and sort the tests
Move webdriver-w3c-tests to misc/

@yugang, @jennycao and I talked the repo structure yesterday
and we thought that on top level we shall remove webdriver/.