adjust outputs in rpmkit.yum_makelistcache; sort by advisory or (package) name, dump valid JSON, etc.
fix the bug that cron job script for yum_makelistcache will only be trapped if it received int or term signal
fix the bug that cron job script for yum_makelistcache sets SELinux labels on wrong dir
make the cron job script for yum_makelistcache less verbose on conf errors