Fix up system tests

system/t04_mirror/CreateMirror30Test_gold

@@ -1,10 +1,11 @@
 opengpg: failure opening keyring '${HOME}/.gnupg/aptlytest.gpg': open ${HOME}/.gnupg/aptlytest.gpg: no such file or directory
+
 Looks like your keyring with trusted keys is empty. You might consider importing some keys.
 Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/InRelease...
-openpgp: Signature made Sun, 13 Mar 2016 12:02:54 MSK using RSA key ID 8B48AD6246925553
+openpgp:  RSA key ID 8B48AD6246925553
 openpgp: Can't check signature: public key not found
 Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/Release...
 Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/Release.gpg...
-openpgp: Signature made Sun, 13 Mar 2016 12:02:54 MSK using RSA key ID 8B48AD6246925553
+openpgp:  RSA key ID 8B48AD6246925553
 openpgp: Can't check signature: public key not found
 ERROR: unable to fetch mirror: failed to verify detached signature: openpgp: signature made by unknown entity

system/t06_publish/PublishRepo31Test_gold

@@ -1,5 +1,5 @@
 openpgp: Passphrase is required to unlock private key "Aptly Tester (don't use it) <test@aptly.info>"
-openpgp: 1024-bit DSA key, ID F30E8CB9CDDE2AF8, created 2014-08-30
+openpgp: 1024-bit DSA key, ID F30E8CB9CDDE2AF8, created
 Loading packages...
 Generating metadata files and linking package files...
 Finalizing metadata files...

system/t06_publish/repo.py

@@ -1,6 +1,7 @@
 import os
 import hashlib
 import inspect
+import re
 import zlib
 from lib import BaseTest
 
@@ -747,6 +748,9 @@ class PublishRepo31Test(BaseTest):
     gold_processor = BaseTest.expand_environ
     configOverride = {"gpgProvider": "internal"}
 
+    def outputMatchPrepare(_, s):
+        return re.sub(r' \d{4}-\d{2}-\d{2}', '', s)
+
     def check(self):
         super(PublishRepo31Test, self).check()