Services: Kea DHCP [new]: Leases DHCPv4 - deduplicate records. appara…

…ntly kea leases from memory can be duplicated (see also https://gitlab.isc.org/isc-projects/kea/-/issues/2293), use the first two fields (ip+mac) to deduplicate them. closes #7136

src/opnsense/scripts/dhcp/get_kea_leases.py

@@ -51,11 +51,14 @@
 
     result = {'records': []}
     header = None
+    dedup_keys = set()
     with open(filename, 'r') as csvfile:
         for idx, record in enumerate(csv.reader(csvfile, delimiter=',', quotechar='"')):
+            rec_key = ','.join(record[:2])
             if idx == 0:
                 header = record
-            elif header:
+            elif header and rec_key not in dedup_keys:
+                dedup_keys.add(rec_key)
                 named_record = {'if': None}
                 for findx, field in enumerate(record):
                     if findx < len(header):