tor-guardmgr: Read the VanguardMode from the consensus, not from the config.
Based on our discussion on torspec!258 (comment 3011734)
If it turns out this is not the behaviour we want, we can update Inner::mode() accordingly.
Based on our discussion on torspec!258 (comment 3011734)
If it turns out this is not the behaviour we want, we can update Inner::mode() accordingly.