Upgrade broken due to need to reinstall pkg
Sometimes, without any good reason, pkg doesn't download itself when running `pkg upgrade -F` but then, when final `pkg upgrade` runs it decides it needs to reinstall itself. When it happens during boot in the middle of upgrade process, i breaks upgrade because there is no network configured to download it.
We need to change pfSense-upgrade to always download pkg just to be sure it will be available when it's needed.
Issue reported by Marcelo Gondim at Brazillian Telegram group