Configuration: added ability to access object members with slashes.

Now URI encoding can be used to escape "/" in the request path:

  GET /config/listeners/unix:%2Fpath%2Fto%2Fsocket/

src/nxt_conf.c

@@ -416,10 +416,13 @@ static void nxt_conf_path_next_token(nxt_conf_path_parse_t *parse,
 nxt_conf_value_t *
 nxt_conf_get_path(nxt_conf_value_t *value, nxt_str_t *path)
 {
+    u_char                 *end;
     nxt_str_t              token;
     nxt_int_t              index;
     nxt_conf_path_parse_t  parse;
 
+    u_char                 buf[256];
+
     parse.start = path->start;
     parse.end = path->start + path->length;
     parse.last = 0;
@@ -436,6 +439,18 @@ nxt_conf_get_path(nxt_conf_value_t *value, nxt_str_t *path)
             return NULL;
         }
 
+        if (nxt_slow_path(token.length > 256)) {
+            return NULL;
+        }
+
+        end = nxt_decode_uri(buf, token.start, token.length);
+        if (nxt_slow_path(end == NULL)) {
+            return NULL;
+        }
+
+        token.length = end - buf;
+        token.start = buf;
+
         switch (value->type) {
 
         case NXT_CONF_VALUE_OBJECT: