Fix RRD key parsing issue with numeric DS names
Fix RRD key parsing issue with numeric DS names

Skrupellos/facette,iaean/facette,vovkasm/facette,Skrupellos/facette,Skrupellos/facette,hirocaster/facette,facette/facette,facette/facette,hirocaster/facette,facette/facette,yonglehou/facette,githubert/facette,githubert/facette,vovkasm/facette,iaean/facette,hirocaster/facette,facette/facette,githubert/facette,psytra/facette,psytra/facette,vovkasm/facette,yonglehou/facette,yonglehou/facette,iaean/facette,psytra/facette