Add yum-cron to automatically update stable packages.
Add yum-cron to automatically update stable packages.

NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,Chuck8080/apiumbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,Chuck8080/apiumbrella,NREL/api-umbrella,apinf/api-umbrella