matches the closes defined namespace log level:

advanced:
  log_namespaced_levels:
    'zh:zstack:unpi': info

would also apply to zh:zstack:unpi:write and zh:zstack:unpi:parse

To limit runtime penalty uses the namespacedLevels as a lazy cache

Avoid poluting the namespacedLevel in the config / UI
Add cache reset on config time log level change