[PATCH] t5551-http-fetch-smart.sh: sort cookies before comparing

With curl-7.61.1 cookies are sorted by creation-time¹. Sort the output used in the 'cookies stored in http.cookiefile when http.savecookies set' test before comparing it to the expected cookies.

¹ https://github.com/curl/curl/commit/e2ef8d6fa ("cookies: support
  creation-time attribute for cookies", 2018-08-28)

Signed-off-by: Todd Zullinger <tmz@pobox.com>
---
[Resending with the list in Cc; sorry for spamming you,
Junio, Jeff, and Gábor.]

The in-development version of Fedora updated to the recently released curl-7.61.1 in the past few days. This isn't breakage from the 2.19.0 cycle, but if the fix looks good to everyone it would be nice to include it. That way other distributions and users who update git and curl to the most recent releases won't run into this test failure.

I tested this against Fedora 30 (curl-7.61.1) as well as previous releases from RHEL/CentOS 6/7 (7.19.7/7.29.0) and Fedora 27/28/29 (7.55.1/7.59.0/7.61.0).

The verbose output is:

expecting success:
	git config http.cookiefile cookies.txt &&
	git config http.savecookies true &&
	git ls-remote $HTTPD_URL/smart_cookies/repo.git master &&
	tail -3 cookies.txt >cookies_tail.txt &&
	test_cmp expect_cookies.txt cookies_tail.txt
++ git config http.cookiefile cookies.txt
++ git config http.savecookies true
++ git ls-remote http://127.0.0.1:5551/smart_cookies/repo.git master
7ae89caac6c721f16555e981eaeed64abc165c5d	refs/heads/master
263207bb5fbfbefbdf1c9c3fa4ae5d9663323217	refs/namespaces/ns/refs/heads/master
++ tail -3 cookies.txt
++ test_cmp expect_cookies.txt cookies_tail.txt
++ diff -u expect_cookies.txt cookies_tail.txt
--- expect_cookies.txt	2018-09-07 07:29:05.231532462 +0000
+++ cookies_tail.txt	2018-09-07 07:29:05.306532366 +0000