Support intermediate certificate in certificate store

Kubernetes-commit: 83a223f5ee3790b7ed54197986d4317e75da1652

util/certificate/certificate_manager_test.go

@@ -60,6 +60,68 @@ iQIgZX08DA8VfvcA5/Xj1Zjdey9FVY6POLXen6RPiabE97UCICp6eUW7ht+2jjar
 e35EltCRCjoejRHTuN9TC0uCoVipAiAXaJIx/Q47vGwiw6Y8KXsNU6y54gTbOSxX
 54LzHNk/+Q==
 -----END RSA PRIVATE KEY-----`)
+var storeTwoCertsData = newCertificateData(`-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----`, `-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----`)
 var expiredStoreCertData = newCertificateData(`-----BEGIN CERTIFICATE-----
 MIIBFzCBwgIJALhygXnxXmN1MA0GCSqGSIb3DQEBCwUAMBMxETAPBgNVBAMMCGhv
 c3QtMTIzMB4XDTE4MTEwNDIzNTc1NFoXDTE4MTEwNTIzNTc1NFowEzERMA8GA1UE