Revert "Add serial number for sw-chichlet-[1-3] switchs"

This reverts commit 148bc24c.

data/grid5000/sites/lille/network_equipments/sw-chiclet-1.json

@@ -344,7 +344,6 @@
     }
   ],
   "model": "cisco 93180YC-EX",
-  "serial": "FDO20401BDX",
   "site": "lille",
   "snmp_community": "public",
   "type": "network_equipment",

data/grid5000/sites/lille/network_equipments/sw-chiclet-2.json

@@ -248,7 +248,6 @@
     }
   ],
   "model": "cisco 93180YC-EX",
-  "serial": "FDO20401LBV",
   "site": "lille",
   "snmp_community": "public",
   "type": "network_equipment",

data/grid5000/sites/lille/network_equipments/sw-chiclet-3.json

@@ -400,7 +400,6 @@
     }
   ],
   "model": "cisco 93180YC-EX",
-  "serial": "FDO20392L7J",
   "site": "lille",
   "snmp_community": "public",
   "type": "network_equipment",

input/grid5000/sites/lille/networks/sw-chiclet-1.yaml

 ---
 sw-chiclet-1:
   model: cisco 93180YC-EX
-  serial: FDO20401BDX
   warranty: 2021-11-30
   ip: 172.17.47.221
   kind: switch

input/grid5000/sites/lille/networks/sw-chiclet-2.yaml

 ---
 sw-chiclet-2:
   model: cisco 93180YC-EX
-  serial: FDO20401LBV
   warranty: 2021-11-30
   alias:
     - name: gw

input/grid5000/sites/lille/networks/sw-chiclet-3.yaml

 ---
 sw-chiclet-3:
   model: cisco 93180YC-EX
-  serial: FDO20392L7J
   warranty: 2021-11-30
   ip: 172.17.47.223
   kind: switch