Extend tests/data_files/Makefile to include CRT's for CRT write test
diff --git a/tests/data_files/server1_csr.opensslconf b/tests/data_files/server1_csr.opensslconf
new file mode 100644
index 0000000..6e7075e
--- /dev/null
+++ b/tests/data_files/server1_csr.opensslconf
@@ -0,0 +1,10 @@
+[ req ]
+distinguished_name = req_distinguished_name
+prompt             = no
+# Restrict to non-UTF8 PrintableStrings.
+string_mask        = nombstr
+
+[ req_distinguished_name ]
+C  = NL
+O  = PolarSSL
+CN = PolarSSL Server 1