Tested with the initial tls-tris client support branch which includes
basic RSASSA-PSS support. Coverage changed from ... to ...:
0/3509/3692/3692/4136
0/2784/3195/3195/4136
Since 2d04cf08cb3413ba9c7271a1884ceca00c56c7e2 ("Test with IPv6 by
default, and IPv4 only if that fails."), the test runner listens on ::1
by default instead of 127.0.0.1.