8308185: Update Http2TestServerConnection to use SSLSocket.startHandshake()

Reviewed-by: djelinski

Author: jaikiran

test/jdk/java/net/httpclient/lib/jdk/httpclient/test/lib/http2/Http2TestServerConnection.java

@@ -292,7 +292,7 @@ private static boolean compareIPAddrs(InetAddress addr1, String host) {
 
     private static void handshake(String name, SSLSocket sock) throws IOException {
         if (name == null) {
-            sock.getSession(); // awaits handshake completion
+            sock.startHandshake(); // blocks until handshake done
             return;
         } else if (name.equals("localhost")) {
             name = "localhost";
@@ -314,7 +314,7 @@ public boolean matches (SNIServerName n) {
         List<SNIMatcher> list = List.of(matcher);
         params.setSNIMatchers(list);
         sock.setSSLParameters(params);
-        sock.getSession(); // blocks until handshake done
+        sock.startHandshake(); // blocks until handshake done
     }
 
     void closeIncoming() {