Consider all linecards when validating connection between equipments

Fixes https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=14888

The desired description was provided by @jlelaura, I just made sure the validator would consider all linecards instead of only the first one.

data/grid5000/sites/rennes/network_equipments/swcore-01-rba.json

@@ -43,9 +43,6 @@
           "uid": "port-channel50"
         },
         {
-          "kind": "channel",
-          "snmp_name": "TenGigabitEthernet1/1/6",
-          "uid": "port-channel50"
         },
         {
           "kind": "channel",
@@ -53,9 +50,6 @@
           "uid": "port-channel51"
         },
         {
-          "kind": "channel",
-          "snmp_name": "TenGigabitEthernet1/1/8",
-          "uid": "port-channel51"
         },
         {
         },
@@ -67,10 +61,48 @@
           "kind": "channel",
           "snmp_name": "TenGigabitEthernet1/1/12",
           "uid": "port-channel286"
+        }
+      ],
+      "rate": 10000000000,
+      "snmp_pattern": "TenGigabitEthernet%LINECARD%/1/%PORT%"
+    },
+    {
+      "kavlan_pattern": "TenGigabitEthernet%LINECARD%/1/%PORT%",
+      "kind": "switch",
+      "ports": [
+        {
+        },
+        {
+        },
+        {
+        },
+        {
+        },
+        {
+        },
+        {
+          "kind": "channel",
+          "snmp_name": "TenGigabitEthernet2/1/5",
+          "uid": "port-channel51"
+        },
+        {
+        },
+        {
+          "kind": "channel",
+          "snmp_name": "TenGigabitEthernet2/1/7",
+          "uid": "port-channel50"
+        },
+        {
+        },
+        {
+        },
+        {
+        },
+        {
         },
         {
           "kind": "channel",
-          "snmp_name": "TenGigabitEthernet1/1/13",
+          "snmp_name": "TenGigabitEthernet2/1/12",
           "uid": "port-channel286"
         }
       ],