added cache invalidation based on a time; default is 6 hours
added cache invalidation based on a time; default is 6 hours

this can be changed in data/site.yml; set "planet_refresh" to number of hours

ManageIQ/planet.manageiq.org,ManageIQ/planet.manageiq.org,ManageIQ/planet.manageiq.org,ManageIQ/planet.manageiq.org