pt-spec.txt describes using `keyid=fingerprint` in torrc `Bridge` lines
dcf pointed out in this comment on #10559 (moved) that
pt-spec.txt claims that little-t tor's parsing of
Bridge lines was extended to support
fingerprint is the digest of the bridge's ID key).
Little-t tor does not support this
keyid= prefix. I've tested it; see comment 3 and comment 4 on #9449 (moved). Since it wasn't ever implemented, the
keyid= prefix to bridge fingerprints should be removed from