[3536] logging example in kea.conf in keactrl fixed

src/bin/keactrl/kea.conf.pre

@@ -74,10 +74,30 @@
 {
   "loggers": [
     {
-      "name": "kea",
+      "name": "kea-dhcp4",
       "output_options": [
           {
-            "output": "@localstatedir@/log/kea.log"
+            "output": "@localstatedir@/log/kea-dhcp4.log"
+          }
+      ],
+      "severity": "INFO",
+      "debuglevel": 0
+    },
+    {
+      "name": "kea-dhcp6",
+      "output_options": [
+          {
+            "output": "@localstatedir@/log/kea-dhcp6.log"
+          }
+      ],
+      "severity": "INFO",
+      "debuglevel": 0
+    }
+    {
+      "name": "kea-dhcp-ddns",
+      "output_options": [
+          {
+            "output": "@localstatedir@/log/kea-ddns.log"
           }
       ],
       "severity": "INFO",