Create certificates with correct string formatting
For conformity, create the certificates using `cert_write` so
so they will all be `printableString`.
diff --git a/tests/data_files/server2.crt b/tests/data_files/server2.crt
index 69c95c5..d5a3ca1 100644
--- a/tests/data_files/server2.crt
+++ b/tests/data_files/server2.crt
@@ -1,21 +1,20 @@
-----BEGIN CERTIFICATE-----
-MIIDfTCCAmWgAwIBAgIBBDANBgkqhkiG9w0BAQUFADA7MQswCQYDVQQGEwJOTDER
-MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN
-MTkwMzEyMTAwNjA2WhcNMjkwMzEyMTAwNjA2WjA0MQswCQYDVQQGEwJOTDERMA8G
-A1UECgwIUG9sYXJTU0wxEjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcN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-HT4P6DSYW8tzS1KW2BGiLICIaTla0w+w3lkvEcf36hIBMJcCAwEAAaOBkjCBjzAd
-BgNVHQ4EFgQUpQXoZLjc32APUBJNYKhkr02LQ5MwYwYDVR0jBFwwWoAUtFrkpbPe
-0lL2udWmlQ/rPrzH/f+hP6Q9MDsxCzAJBgNVBAYTAk5MMREwDwYDVQQKDAhQb2xh
-clNTTDEZMBcGA1UEAwwQUG9sYXJTU0wgVGVzdCBDQYIBAzAJBgNVHRMEAjAAMA0G
-CSqGSIb3DQEBBQUAA4IBAQBYbmGUE3tboOInTANuIf63NHlNGw0Zx79G9Oxv8gny
-oBwzIg7LGeiuIeSJXGLZ6+MVR6vjCSm4lYVFbLmrk7DRRb+JlB/9knpAtMIzT4JB
-x/eDnoI9/gNO8K8pLFmNkcXBdr/QxVR+Ao/kPWHoWQtxnzfyusZlbYNvFlchORCw
-m1Wcvksm9LiIXDknugnXrAc2itXY1Iq8QmyFR/SXn3IMrn1LMlwgLOl6RccliBNm
-YmyNC+pRJ047hjzMIgDT0FZH3eVgJ93b3ec4bxY1tPPlAAx1QwFGnXlt67QzsLCb
-WBKL+sRYcWvNwEUnwbOii6N895YciSZUnzCo53uhJq6/
+HT4P6DSYW8tzS1KW2BGiLICIaTla0w+w3lkvEcf36hIBMJcCAwEAAaNNMEswCQYD
+VR0TBAIwADAdBgNVHQ4EFgQUpQXoZLjc32APUBJNYKhkr02LQ5MwHwYDVR0jBBgw
+FoAUtFrkpbPe0lL2udWmlQ/rPrzH/f8wDQYJKoZIhvcNAQEFBQADggEBADKYPgMz
+Yubn4e2dXk10mV10TluuqfaguFfx/fcn34WbhVouXuId+RKySiOKxTJI9izXfP1G
+pg8+rNj4dqiSpTTRd+XV3OUO2E4DxE/Hfd3yP89nG0/5SyBcuug/xvyQOcB1G97j
+ImG9vS6GFwrx39I7MckYreYbYtAdq33b0xOLlNMVzM/TAInAnD8iuht2N6dwPu8z
+eoGUHCR4KwiB8GB3DqMlW5XyL7G/u/HIEsgP005Cd3sbGWDg4xSa0RD7XOLcgGp3
+YoWEsOdIBWgDwezWL4RKKKVti6gm7OcnlJ/pBnLMqSf+YN/5UJ209GMiAWCU2AKG
+gyo6Qo35SIy+Fuw=
-----END CERTIFICATE-----