Re: [libvirt] [PATCH 2/5] Several fixes to libvirtd's log setup

Similar as for general libvirt, don't convert high priority levels to debug level. Ignore LIBVIRT_LOG_FILTERS and LIBVIRT_LOG_OUTPUTS when they're set to the empty string, otherwise they can override a valid setting from the config file. Send all settings through the parser functions for validation, so that the existence of a bad setting doesn't nullify a good setting that should have applied -- particularly the default output. Keep the order of precedence consistent for all variables between the environment and the config file. Warn when an invalid log level, filter, or output is ignored.