Description:
------------
When calling curl_getinfo() on a pushed curl handle, the resulting entries return bad timing info, bad URL, empty primary_ip, etc.

Test script:
---------------
$mh = curl_multi_init();

curl_multi_setopt($mh, CURLMOPT_PUSHFUNCTION, $onPush = function ($p, $c, $h) {
    return CURL_PUSH_OK;
});

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://http2-push.io');
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_multi_add_handle($mh, $ch);

do {
    while (CURLM_CALL_MULTI_PERFORM === curl_multi_exec($mh, $active));

    while ($info = curl_multi_info_read($mh)) {
        print_r(curl_getinfo($info['handle']));
    }

    if (-1 === curl_multi_select($mh)) {
        usleep(1000);
    }
} while ($active);


Expected result:
----------------
entry "url" should be set to the pushed URL
entry "primary_ip" should be set to the pushing server IP
entry "starttransfer_time" should return plausible value
etc.

Actual result:
--------------
entry "url" is set to the URL of the parent response
entry "primary_ip" is empty
entry "starttransfer_time" is 0.0 or some impossible (more than 1M seconds)
etc.