6814140: deadlock due to synchronized demandLogger() code that locks ServerLogManager

Summary: Making demandLogger() non-synchronized resolves the deadlock.
Reviewed-by: dcubed

src/share/classes/java/util/logging/LogManager.java

@@ -338,7 +338,7 @@ public class LogManager {
     // already been created with the given name it is returned.
     // Otherwise a new logger instance is created and registered
     // in the LogManager global namespace.
-    synchronized Logger demandLogger(String name) {
+    Logger demandLogger(String name) {
         Logger result = getLogger(name);
         if (result == null) {
             result = new Logger(name, null);