retain order of provider parameter descriptors

Change-Id: Ifef63adad1803dc21cf4c5599216b273fe2ed4c5
Reviewed-on: http://gerrit.esdi-community.eu/3189
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>