[INTERNAL] sap.m.Image - Correct context is now returned from setActiveSrc setter
[INTERNAL] sap.m.Image - Correct context is now returned from setActiveSrc setter

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

Change-Id: I35ab49ac4de22fc18124496dedbdf8a703136661

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