Fix remaining

Author: hyperxpro

client/src/test/java/org/asynchttpclient/BasicHttp2Test.java

@@ -338,6 +338,7 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
     public void startServer() throws Exception {
         X509Bundle bundle = new CertificateBuilder()
                 .subject("CN=localhost")
+                .setIsCertificateAuthority(true)
                 .buildSelfSigned();
 
         serverSslCtx = SslContextBuilder.forServer(bundle.toKeyManagerFactory())