aconfig: rename namespace -> package

What used to be referred to as a namespace is now called a package.

This CL is a semantic change only.

Bug: 285000854
Test: m nothing
Test: atest aconfig.test
Change-Id: If3fca67c415af75b44f316e16666b97089407069
diff --git a/tools/aconfig/templates/cpp.template b/tools/aconfig/templates/cpp.template
index ae8b59f..deb5012 100644
--- a/tools/aconfig/templates/cpp.template
+++ b/tools/aconfig/templates/cpp.template
@@ -1,18 +1,18 @@
-#ifndef {namespace}_HEADER_H
-#define {namespace}_HEADER_H
-#include "{namespace}.h"
+#ifndef {package}_HEADER_H
+#define {package}_HEADER_H
+#include "{package}.h"
 {{ if readwrite }}
 #include <server_configurable_flags/get_flags.h>
 using namespace server_configurable_flags;
 {{ endif }}
-namespace {namespace} \{
+namespace {package} \{
     {{ for item in class_elements}}
     class {item.flag_name} \{
         public:
             virtual const bool value() \{
                 {{ if item.readwrite- }}
                 return GetServerConfigurableFlag(
-                    "{namespace}",
+                    "{package}",
                     "{item.flag_name}",
                     "{item.default_value}") == "true";
                 {{ -else- }}