ignore workspace from test product

Change-Id: Ied55526a9dcf5aef1593e689b414c320c6d39e3a
Reviewed-on: http://gerrit.esdi-community.eu/3131
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>