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Describe the bug When defining the "kea-dhcp4" logger with output options and further sub-loggers like "kea-dhcp4.alloc-engine" without output options, they won't appear in the file defined in the parent logger.

To Reproduce Steps to reproduce the behavior:

1. Run Kea dhcpv4 with the following logger config

  "loggers": [
    {
      "name": "kea-dhcp4",
      "severity": "INFO",
      #"severity": "DEBUG",
      "debuglevel": 55,
      "output_options": [
        {
          "output": "/var/log/kea/kea.log",
          #"output": "/tmp/keadebug.log",
          "flush": true,
          "maxver": 8
        }
      ]
    },
    {
      "name": "kea-dhcp4.alloc-engine",
      "severity": "DEBUG",
      "debuglevel": 70
    }
  ]

2. A client requests an IP
3. There are no log messages from alloc-engine in /var/log/kea/kea.log

Expected behavior Debug-level alloc-engine messages.

Environment:

• Kea version: 1.8.1
• OS: Ubuntu 18.04 x64]
• Which features were compiled in: cloudsmith
• If/which hooks where loaded in: kea-ha, lease-commands