test: fixed go TLS tests by adding localhost to SAN in TLS certicate

  - Go >= 1.15 dropped support for verifying hostname/IP address in
    the Common Name field of a certificate. It now requires that the
    hostname be present in Subject Alternative Names (SAN) extension.
    See golang/go#39568 (comment)

Author: shahruk10

grpc/go-juzu/tls_test.go

@@ -30,60 +30,57 @@ import (
 
 // The TLS certificates below were generated using:
 //
-// openssl req -new -x509 -newkey rsa:2048 -days 36500 -keyout key.pem -out cert.pem -nodes
+// openssl req -new -x509 -newkey rsa:2048 -days 36500 -keyout key.pem -out cert.pem -nodes -subj "/CN=localhost" -addext "subjectAltName=DNS:localhost"
 //
 // and are used for testing only. Do not use in production.
 
 var certPem = []byte(`-----BEGIN CERTIFICATE-----
-MIIDlTCCAn2gAwIBAgIUISO9AdBzEIxv366ruyRniPVrA8AwDQYJKoZIhvcNAQEL
-BQAwWTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
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+DWWJnuh3aXY43/Fz32Srdl7RWgw7Y6j4LGKgF4n07h7qcsdp+g==
 -----END CERTIFICATE-----`)
 
 var keyPem = []byte(`-----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDdF183r5B4ZeM6
-77SYQrf7JWc26eBN60mqOSC18aeRxkeQsgO4X3Y7wpQRcVdsm/i291otNIOWm4mJ
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 -----END PRIVATE KEY-----`)
 
 func setupGRPCServerWithTLS(mutual bool) (*grpc.Server, int, error) {