add initial support for RFC 4279 PSK SSL ciphersuites

PR: 1191
Submitted by: Mika Kousa and Pasi Eronen of Nokia Corporation
Reviewed by: Nils Larsch
diff --git a/test/testssl b/test/testssl
index 8ac90ae..f9d7c5d 100644
--- a/test/testssl
+++ b/test/testssl
@@ -142,4 +142,10 @@
   fi
 fi
 
+echo test tls1 with PSK
+$ssltest -tls1 -cipher PSK -psk abc123 $extra || exit 1
+
+echo test tls1 with PSK via BIO pair
+$ssltest -bio_pair -tls1 -cipher PSK -psk abc123 $extra || exit 1
+
 exit 0