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tls1.2版本可在tls config中配置：

        tlsconf := &tls.Config{
                InsecureSkipVerify:       true,
                MaxVersion:               tls.VersionTLS13,
                MinVersion:               tls.VersionTLS12,
                PreferServerCipherSuites: true,
        }
        tlsconf.CipherSuites = []uint16{
                tls.TLS_AES_128_GCM_SHA256,
                tls.TLS_CHACHA20_POLY1305_SHA256,
                tls.TLS_AES_256_GCM_SHA384,
                tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
                tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
                tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
                tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
                tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
                tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
                tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
                tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
                tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
                tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
                tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
        }

tls1.3看官方文档不支持配置CipherSuites，在tls/common.go中initDefaultCipherSuites()会根据cpu是否支持aes硬解设置TLS_AES_128_GCM_SHA256或TLS_CHACHA20_POLY1305_SHA256优先

https://golang.org/src/crypto/tls/common.go
https://golang.org/pkg/crypto/tls/#Config

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