Package updates #588
Description
Packages installed with the iocage.Pkg module need to be updated. The current procedure to update packages is to run the installation ioc pkg <JAIL> <packages> again.
Instead a dedicated upgrade command should first upgrade packages in the local mirror and then run a full upgrade in the jail itself. Both steps should be independent, so that a release package mirror can be upgraded without requiring any jail.
Pull updates of all mirrored packages
ioc pkg upgrade
Pull updates and upgrade them in the jail
ioc pkg upgrade <JAIL>