Add test support for TLS signature types.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2301)
diff --git a/test/ssl_test_ctx.h b/test/ssl_test_ctx.h
index b34efe3..13652b0 100644
--- a/test/ssl_test_ctx.h
+++ b/test/ssl_test_ctx.h
@@ -165,10 +165,14 @@
     int expected_server_cert_type;
     /* Expected server signing hash */
     int expected_server_sign_hash;
+    /* Expected server signature type */
+    int expected_server_sign_type;
     /* Expected client certificate key type */
     int expected_client_cert_type;
     /* Expected client signing hash */
     int expected_client_sign_hash;
+    /* Expected client signature type */
+    int expected_client_sign_type;
 } SSL_TEST_CTX;
 
 const char *ssl_test_result_name(ssl_test_result_t result);