Fabrice Bellet authored Apr 05, 2020 and Olivier Crête committed May 05, 2020

When an existing peer-reflexive remote candidate is updated to a server
reflexive one, due to the late reception of remove candidates, this
update has several consequences on the conncheck list:

 - pair foundations and priorities must be recomputed
 - the highest nominated pair may have changed too
 - this is not strictly required, but some pairs that had *a lower*
   priority than the previously peer-reflexive nominated pair, had
   their retransmit flag set to false, for this reason. These pairs may
   now have *a higher* priority than the newly promoted nominated pair,
   and it is fair in that case to turn their retransmit flag back to
   true.