Use the namepace as the java package name in aconfig and call the class "Flags"

Test: aconfig.test
Change-Id: I15032262aad2c80d1ec1bd8fa81664a846b307ec
diff --git a/tools/aconfig/templates/java.template b/tools/aconfig/templates/java.template
index ebcd607..89da18b 100644
--- a/tools/aconfig/templates/java.template
+++ b/tools/aconfig/templates/java.template
@@ -1,8 +1,8 @@
-package com.android.internal.aconfig;
+package {namespace};
 {{ if readwrite }}
 import android.provider.DeviceConfig;
 {{ endif }}
-public final class {namespace} \{
+public final class Flags \{
     {{ for item in class_elements}}
     public static boolean {item.method_name}() \{
         {{ if item.readwrite- }}