lua: use notice level for log()
By default, notice level is set. Thus, if users want to use log() in the same way as pre-5.4, they'd have to increase the log level. This bumps the log level of log() function to keep the same behavior.
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By default, notice level is set. Thus, if users want to use log() in the same way as pre-5.4, they'd have to increase the log level. This bumps the log level of log() function to keep the same behavior.