parser: copy strings?

[Hal Murray]

Should strings be copied over?

                case T_Cert:
                    my_node->ctl.nts_cfg.cert = option->value.s;
                    break;

                case T_Cert:
                        ntsconfig.cert = estrdup(nts->value.s);
                        break;

Should we free up existing ones?
  That is probably a bug/quirk in the config file, but I could
  imagine somebody swapping the order of two lines rather
  than commenting one out.


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