[srv.init] Rework init to use module iterator

Init now uses a module iterator that facilitates filtering on module
type.

src/user/srv.init/main.cpp

@@ -1,6 +1,13 @@
+#include <stdio.h>
 #include "j6/syscalls.h"
+#include "init_args.h"
+
 #include "modules.h"
 
+using kernel::init::module;
+using kernel::init::module_type;
+using kernel::init::module_program;
+
 extern "C" {
     int main(int, const char **);
 }
@@ -14,7 +21,15 @@ int
 main(int argc, const char **argv)
 {
     j6_system_log("srv.init starting");
-    modules::load_all(_arg_modules_phys);
+
+    modules mods = modules::load_modules(_arg_modules_phys, handle_system, handle_self);
+
+    char message[100];
+    for (auto &mod : mods.of_type(module_type::program)) {
+        auto &prog = static_cast<const module_program&>(mod);
+        sprintf(message, "  program module '%s' at %lx", prog.filename, prog.base_address);
+        j6_system_log(message);
+    }
 
     return 0;
 }