Supporting UNIX sockets in address matching.

This closes #645 issue on GitHub.

(Also moved a changelog line that was misplaced in a previous commit.)

src/nxt_http_route_addr.c

@@ -41,6 +41,16 @@ nxt_http_route_addr_pattern_parse(nxt_mp_t *mp,
         base->negative = 0;
     }
 
+    if (nxt_str_eq(&addr, "unix", 4)) {
+#if (NXT_HAVE_UNIX_DOMAIN)
+        base->addr_family = AF_UNIX;
+
+        return NXT_OK;
+#else
+        return NXT_ADDR_PATTERN_NO_UNIX_ERROR;
+#endif
+    }
+
     if (nxt_slow_path(addr.length < 2)) {
         return NXT_ADDR_PATTERN_LENGTH_ERROR;
     }