[FEATURE] Mockserver: Improve "search" param behavior: SUBSTRINGOF
[FEATURE] Mockserver: Improve "search" param behavior: SUBSTRINGOF

The initial implementation of the "search" parameter used the
"startswith" semantic for searing. Actually the substringof is more
realistic. 

Change-Id: I0042760cf53021868e1bcd456712f1ac7bc303cc

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