
This patch adds the --purge parameter from 'nova-manage db' when executing the cleanup tasks. It will add the --purge parameter to the archive_deleted_rows cron and will add an additional cron to exclusively purge the shadow tables. This feature is relevant due to the fact that we were not purging the databases before running upgrades, leading to the increase of the DB sizes. Change-Id: I4ac0c9bd30463c546b141326b1293c78f845cf81