8313815: The exception messages printed by jcmd ManagementAgent.start are corrupted on Japanese Windows

Reviewed-by: kevinw, cjplummer, phh

Author: yukikimmura

src/jdk.attach/share/classes/sun/tools/attach/HotSpotVirtualMachine.java

@@ -356,7 +356,7 @@ int readInt(InputStream in) throws IOException {
     String readErrorMessage(InputStream in) throws IOException {
         String s;
         StringBuilder message = new StringBuilder();
-        BufferedReader br = new BufferedReader(new InputStreamReader(in));
+        BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));
         while ((s = br.readLine()) != null) {
             message.append(s);
         }