[INTERNAL] sap.m.ScrollContainer - Correct context is now returned from setters
[INTERNAL] sap.m.ScrollContainer - Correct context is now returned from setters

- setHorizontal return correct context
- setVertical return correct context
- Global qunit test will be added - https://git.wdf.sap.corp:8080/#/c/1647368/

Change-Id: I579e8773b9a608407edcbabd44f6bfb3bff7b399

SAP/openui5,SAP/openui5,SAP/openui5,nzamani/openui5,SQCLabs/openui5,cschuff/openui5,SAP/openui5,olirogers/openui5,cschuff/openui5,SQCLabs/openui5,nzamani/openui5,cschuff/openui5,olirogers/openui5,SQCLabs/openui5,nzamani/openui5,olirogers/openui5