Close generated address space files once the code generation is done

Not closing the generated files may cause some errors when trying
to interpret the files in the same script later on (i.e. parsing errors due
to half written files).

schemas/generate_address_space.py

@@ -39,6 +39,7 @@ class CodeGenerator(object):
                 self.make_method_code(node)
             else:
                 sys.stderr.write("Not implemented node type: " + node.nodetype + "\n")
+        self.output_file.close()
 
     def writecode(self, *args):
         self.output_file.write(" ".join(args) + "\n")