[INTERNAL] QUnitUtils: generic fix for the IE9 sinon XHR issue
[INTERNAL] QUnitUtils: generic fix for the IE9 sinon XHR issue

Sinon doesn't fake the XHR in IE9 properly when CORS support is not
enabled because it internally falls back to the XDomainRequest. This
finally causes some QUnit tests with sinon to break on IE9 if they do
not explicitly set the supportCORS property for sinon.xhr to true.

Change-Id: Iad3725f97cfccb6224ceafa44e039ad1d3046cc3
BCP: 1580166680

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