[FIX] sap.m.Panel: Support for nested panels added
[FIX] sap.m.Panel: Support for nested panels added

Change-Id: I563de8743a355782203a3c4c3c7e749de22aabd7
BCP: 1570040810
Signed-off-by: Deyan Yanakiev <2614bfd3515c6c39ab25ed6159ddb09df1e2cc71@sap.com>

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