test: Remove string.t

[u5surf]

• the location which includes %le sequence only skip %
• thus the case of se%lect just becomes select.

The sequence has reached｀%`, it skips and breaks in L.1668 and it scans next character.

The next character is l, it unstatisfies 0-9a-f, then the state has become sw_usual and the l has stored the dst in L.1691-L.1693.
Finally, se%lect becomes simply select.

tengine/src/core/ngx_string.c

Lines 1657 to 1695 in c2e166a

	switch (state) {
	case sw_usual:
	if (ch == '?'
	&& (type & (NGX_UNESCAPE_URI|NGX_UNESCAPE_REDIRECT)))
	{
	*d++ = ch;
	goto done;
	}
	if (ch == '%') {
	state = sw_quoted;
	break;
	}
	*d++ = ch;
	break;
	case sw_quoted:
	if (ch >= '0' && ch <= '9') {
	decoded = (u_char) (ch - '0');
	state = sw_quoted_second;
	break;
	}
	c = (u_char) (ch | 0x20);
	if (c >= 'a' && c <= 'f') {
	decoded = (u_char) (c - 'a' + 10);
	state = sw_quoted_second;
	break;
	}
	/* the invalid quoted character */
	state = sw_usual;
	*d++ = ch;
	break;

Signed-off-by: u5surf [email protected]

[chobits]

Hi, I am also looking at this case. Then you can remove this case directly because it is deprecated. See following:

(link commit ca58fa3)

This test cases was used to test old tengine feature, as following:

```
    commit ca58fa3a038cd932e8152d9307be07f7918b5260
    Author: Weibin Yao <[email protected]>
    Date:   Wed Apr 17 12:10:42 2013 +0800
    fixed the missing with invalid character for ngx_unescape_uri
```

After we removed this feature when we upgraded tengine core to
nginx-1.8.x, the case string.t is deprecated.

[chobits]

also note that , if you cannot pass tests/nginx-tests/tengine-tests/ngx_dtls.t for some reason, you can just skip it in ci.yml.
It is a standalone project for DTLS https://github.com/Tongsuo-Project/Tongsuo, which should be tested by their team

I think there should be a standalone CI/CD workflow for dtls.

[u5surf]

@chobits I removed string.t in this PR. Can you check again please?

[chobits]

Thanks, ack