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/test-ca.crt b/tests/data_files/test-ca.crt
index 7a17822..561d0e2 100644
--- a/tests/data_files/test-ca.crt
+++ b/tests/data_files/test-ca.crt
@@ -1,21 +1,20 @@
-----BEGIN CERTIFICATE-----
-MIIDhzCCAm+gAwIBAgIBADANBgkqhkiG9w0BAQUFADA7MQswCQYDVQQGEwJOTDER
-MA8GA1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwHhcN
-MTkwMzEyMTIwNDU5WhcNMjkwMzEyMTIwNDU5WjA7MQswCQYDVQQGEwJOTDERMA8G
-A1UECgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0EwggEiMA0G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-gZUwgZIwHQYDVR0OBBYEFLRa5KWz3tJS9rnVppUP6z68x/3/MGMGA1UdIwRcMFqA
-FLRa5KWz3tJS9rnVppUP6z68x/3/oT+kPTA7MQswCQYDVQQGEwJOTDERMA8GA1UE
-CgwIUG9sYXJTU0wxGTAXBgNVBAMMEFBvbGFyU1NMIFRlc3QgQ0GCAQAwDAYDVR0T
-BAUwAwEB/zANBgkqhkiG9w0BAQUFAAOCAQEAYDDFsUzrjOj/QoyuUeW1s1O/30pl
-HjDAbIroaTR4xUYQEjL6GCOMV9q51Sq5epTMk4ElbGZckMZvtnsKdDqzc1io9Ke+
-+NeKyhXpCx34FVAzBl8ywfwLt20qbzAlTeqHQiOeCUldRqZet4qLmae8bivCCP0V
-0rt7xaV6nxQWmyqX2eCSNexMFDUdhCMo6rXXKvh7CwFhEwIENtRsOeUO2iFViXL1
-Iq0myvt3Fg9nsVfrcVJmlalXxvBjaz/bO4l77E6gJE1Zk9FdbjvALnkUJZwpo+yE
-Flue8ljNjMTVMbGZBHSJHjnBLp3bbasETkUOt8NRbAwI43M4E8upX17V6g==
+UDBOMAwGA1UdEwQFMAMBAf8wHQYDVR0OBBYEFLRa5KWz3tJS9rnVppUP6z68x/3/
+MB8GA1UdIwQYMBaAFLRa5KWz3tJS9rnVppUP6z68x/3/MA0GCSqGSIb3DQEBBQUA
+A4IBAQCGHRK2wY/RFqnpOOg3euDWbuv3KmcuYTffM3WPYpGNIplpQ6i7fzzOUXVK
+OFN1vIQOhRiINmQDz4UbOC0hPPLIARNddjs+ZJOsNJzI3KRaWOrPUpJZcf2IKn9u
+A61mn4MPgfvvZ+fomagdzbIxP1xI8nxr6EVGEutmCU/HiQGI+0BEBP0EnaOitUxc
+4rEoqaJ3VFyzhZ/TaHbjSSL/1wFOK4YzinNeaAdPJW8Acab7TkBBQxfX3Q/xZn6D
+hIVjoMD4kqgJ68//A6dPFKTH1R+QlBmKNSEw69/wHUEvpqFnvvmxO+uhCjnE/tcp
+YEgyXlCL2lv0XP3cq1OMTGyxHK/Y
-----END CERTIFICATE-----