Test bug due to openjdk.java.net => openjdk.org change.

VThreadNotifyFramePopTest failed!
STDERR:
java.net.UnknownHostException: openjdk.java.net
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:560)
at java.base/java.net.Socket.connect(Socket.java:666)
at java.base/java.net.Socket.connect(Socket.java:600)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:183)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:531)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:636)
at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:279)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:384)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:406)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1308)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1241)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1127)
at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1056)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1661)