basic support for initialization parameters

I added a new type that allows you to manage initialization parameters through puppet. You'd use it like this:

        init_param{memory_target:
                value   => '0',
        }

        init_param{control_file_record_keep_time:
                value   => '42',
        }

        init_param{audit_trail:
                value   => 'NONE',
        }