certlib: fix CSR FileKind, add test cases.

certlib/testdata/rsa-ca-cert.pem

@@ -1,14 +1,34 @@
 -----BEGIN CERTIFICATE-----
-MIICHDCCAc6gAwIBAgIVAN1AKHhLNsqcBEKYCqgjEMG65hhvMAUGAytlcDCBiTEL
-MAkGA1UEBhMCVVMxCTAHBgNVBAgTADEJMAcGA1UEBxMAMSIwIAYDVQQKExlXTlRS
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-BgEB/wIBAzAdBgNVHQ4EFgQUetUgY5rlFq+OCeYe0Eqmp8Ek488wBQYDK2VwA0EA
-LIFZo6FQL+8q8h66Bm7favIh2AlqsXA45DpRUN2LpjNm/7NbTPDw52y8cLegUUMc
-UhDyk20fGg5g6cLywC0mDA==
------END CERTIFICATE-----
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+EaRCxfUq2tmFzL2NhJLJlvNhpe7Zt5s/UF1oiQ==
+-----END CERTIFICATE-----