Bootstrapping during reconnect causes delay in connection

When the server indicates that it now supports collections (and they're enabled our side) when previously it didn't then we do a SDK wide connections rebuild so that all connections have collections enabled and supported. If one of those connections is in bootstrap at this point then the dialler will see an error occurred during bootstrap (we cancelled the operation) and will add the node to the backoff cache so no further connections to that node will be attempted for 5s.