switch to use use_strongest_server_key
switch to use use_strongest_server_key

use the same behavior as 1.4 release.

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal