Remove dkhostmaster from TLS tests. (#2819)

Author: floitsch

tests/tls-test-slow.toit

@@ -48,12 +48,11 @@ run-tests:
   working := [
     "amazon.com",
     "adafruit.com",
-    // "ebay.de",  // Currently the IP that is returned first from DNS has connection refused.
+    "ebay.de",
 
     // Connect to the IP address at the TCP level, but verify the cert name.
     "$(dns.dns-lookup "amazon.com" --network=network)/amazon.com",
 
-    "dkhostmaster.dk",
     "gnu.org",  // Doesn't work with Toit mode, falls back to MbedTLS C code for symmetric stage.
 
     "sha256.badssl.com",