[webapi] Update open_app to app_launcher

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 74, fail 0, block 0
[stability] Update open_app to app_launcher

Impacted tests(approved): new 0, update 5, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 5, fail 0, block 0
[stability]Add new tcs

[Detailed commit message (if have)]
Impacted TCs num(approved):New 3,Update 0,Delete 0
UT result: Pass 3, Fail 0, Block 0
Merge pull request #1241 from yunxliu/yunxliu/webapi/modifyScript_case

[webapi] Update open_app to app_launcher
Merge pull request #1246 from linshen/shenlin/update-stability-1

[stability]Add new tcs
Merge pull request #1242 from yunxliu/yunxliu/stability/modifyScript_case

[stability] Update open_app to app_launcher
[atip]Modify commands used on IVI to be the latest
[wrt]modify open_app to app_launch

[Detailed commit message (if have)]
Impacted TCs num(approved):New 0,Update 18,Delete 0
UT result: Pass 10, Fail 5, Block 3
BUGID:https://crosswalk-project.org/jira/browse/XWALK-2773
Merge pull request #1247 from chenxix/tools/modify-command

[atip]Modify commands used on IVI to be the latest
Merge pull request #1248 from linshen/shenlin/rename_open_app1

[wrt]modify open_app to app_launch