test: add certificate with root CommonName

Signed-off-by: Benjamin Wang <wachao@vmware.com>

tests/fixtures/CommonName-root.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE5zCCA8+gAwIBAgIJAKooGDZuR2mMMA0GCSqGSIb3DQEBCwUAMH8xCzAJBgNV
+BAYTAkNOMRAwDgYDVQQIDAdCZWlqaW5nMRAwDgYDVQQHDAdCZWlqaW5nMQ0wCwYD
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+G6+TiB3gGUUlTsdy0+LS2psL71RS5Jv7g/7XGmSKBPqRmYyQ2t7m2kLPwWKtL5tE
+63c0FPtpV0FzKdU=
+-----END CERTIFICATE-----

tests/fixtures/CommonName-root.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAxACnI84bTht4VmwFAm7nRNYDznrXk9CDZNp4DdrgjGI2EmZm
+hoVvxmZNxL1e8ClboXU8q4d+hOSGo54PXdrdYjlP/I0TlPrgMq0twv0uT/7q6vFQ
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+4kvQqnJg97fRBbyzvQcdL36kL8+pbmHNoqHPwxbuigYShB74d6/h
+-----END RSA PRIVATE KEY-----