[INTERNAL] sap.m.Panel: QUnit tests improvement
[INTERNAL] sap.m.Panel: QUnit tests improvement

Change-Id: I83a39b5ca2a4a5e35b8f78269ad9ba931701c9cc
Signed-off-by: Deyan Yanakiev <2614bfd3515c6c39ab25ed6159ddb09df1e2cc71@sap.com>

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