[strasbourg][fleckenstein] Add nodeset property

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-1.json

...rasbourg/clusters/fleckenstein/nodes/fleckenstein-10.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-2.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-3.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-4.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-5.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-6.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-7.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-8.json

...trasbourg/clusters/fleckenstein/nodes/fleckenstein-9.json

.../sites/strasbourg/clusters/fleckenstein/fleckenstein.yaml