[3975] Updated default Kea configuration file with expiration config.

src/bin/keactrl/kea.conf.pre

@@ -19,6 +19,22 @@
     "type": "memfile"
   },
 
+# Setup reclamation of the expired leases and leases affinity.
+# Expired leases will be reclaimed every 10 seconds. Every 25
+# seconds reclaimed leases, which have expired more than 3600
+# seconds ago, will be removed. The limits for leases reclamation
+# are 100 leases or 250 ms for a single cycle. A warning message
+# will be logged if there are still expired leases in the
+# database after 5 consecutive reclamation cycles.
+  "expired-leases-processing": {
+    "reclaim-timer-wait-time": 10,
+    "flush-reclaimed-timer-wait-time": 25,
+    "hold-reclaimed-time": 3600,
+    "max-reclaim-leases": 100,
+    "max-reclaim-time": 250,
+    "unwarned-reclaim-cycles": 5
+  },
+
 # Global (inherited by all subnets) lease lifetime is mandatory parameter.
   "valid-lifetime": 4000,
 
@@ -46,6 +62,22 @@
     "type": "memfile"
   },
 
+# Setup reclamation of the expired leases and leases affinity.
+# Expired leases will be reclaimed every 10 seconds. Every 25
+# seconds reclaimed leases, which have expired more than 3600
+# seconds ago, will be removed. The limits for leases reclamation
+# are 100 leases or 250 ms for a single cycle. A warning message
+# will be logged if there are still expired leases in the
+# database after 5 consecutive reclamation cycles.
+  "expired-leases-processing": {
+    "reclaim-timer-wait-time": 10,
+    "flush-reclaimed-timer-wait-time": 25,
+    "hold-reclaimed-time": 3600,
+    "max-reclaim-leases": 100,
+    "max-reclaim-time": 250,
+    "unwarned-reclaim-cycles": 5
+  },
+
 # Addresses will be assigned with preferred and valid lifetimes
 # being 3000 and 4000, respectively. Client is told to start
 # renewing after 1000 seconds. If the server does not respond