[INTERNAL] Karma: Only print coverage summary
[INTERNAL] Karma: Only print coverage summary

This reduces the console output a lot, especially within watch mode.
Detailed results can be viewed from the HTML report.

Change-Id: Ib399caa547626fdebd9b7e5f30c11f22c6ec8463

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5