Regression: team member list management

[SimonSapin]

#267 has eliminated differences between the list of people nominally members of a team and people who we request / require approval from when doing an FCP.

However these differences are not always accidental. In the libs team we have removed people (or people have removed themselves, like in e48f83f) from the latter without removing them from the former. This can happen when someone’s time availability reduces (possibly because of varied responsibilities) and we’d rather not block every FCP on them.

Compare for example:

• Implement iter::Sum and iter::Product for Option rust#58975 (comment)
• Tracking issue for RFC 1789: Conversions from &mut T to &Cell<T> rust#43038 (comment)

CC @pietroalbini @alexcrichton

[Centril]

I believe the fix should be done in rust-lang/team; basically, it reports the wrong data to rfcbot so you need to split the list of libs team members into the "real list" and the fcp list.

[pietroalbini]

Working on a fix on the team repo's side.