Do not use reference to avoid losing data
Ignore upgrade_167_to_168() when upgrade_166_to_167() runs, they are both the same
Always run additional_config_upgrade() and do it after config is written
Each item in additional_config_upgrade() must write config after changing it
Detect old workarounds in config upgrade and deal with them
Bring upgrade_166_to_167() to 2.3 world
Move workaround used to enable pkg metadata update cronjob to a generic mechanism
Check if specific config upgrade code already ran and skip it
Add a function to be called every time convert_config() runs
Hide dashboard update period control. No longer needed with central refresh system
(cherry picked from commit 5e024279579ec76486f7cff713eecdb83611ed37)
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