Enforce multiplicity rules when parsing annotations.

We would never actually enforce multiplicity rules when parsing
annotations, since the counts array never got entries added to it for
annotations in the token list that got added by earlier calls to
tokenize_string.

Found by piebeer.

src/or/routerparse.c

@@ -3181,6 +3181,9 @@ tokenize_string(memarea_t *area,
     end = start+strlen(start);
   for (i = 0; i < _NIL; ++i)
     counts[i] = 0;
+
+  SMARTLIST_FOREACH(out, const directory_token_t *, t, ++counts[t->tp]);
+
   while (*s < end && (!tok || tok->tp != _EOF)) {
     tok = get_next_token(area, s, end, table);
     if (tok->tp == _ERR) {