[nancy] add waranty for sgrapheneib sgrele-opf sgrisou1

input/grid5000/sites/nancy/networks/sgrapheneib.yaml

 ---
 sgrapheneib:
   model: Infiniband
+  warranty: 11.2015
   kind: switch
   site: nancy
   snmp_community: public

input/grid5000/sites/nancy/networks/sgrele-opf.yaml

@@ -2,6 +2,7 @@
 #Information in this file can be incorrect #TODO
 sgrele-opf:
   model: Omni-Path
+  warranty: 06.2022
   kind: switch
   site: nancy
   snmp_community: public

input/grid5000/sites/nancy/networks/sgrisou1.yaml

 ---
 sgrisou1:
   model: Dell S3048
+  warranty: 06.2022
   kind: switch
   site: nancy
   snmp_community: public