feat: support set ReqClient from env (#1354)

Co-authored-by: mikatong <mikatong@tencent.com>

Author: tongyiming

tencentcloud/connectivity/transport.go

@@ -7,9 +7,12 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"os"
 	"time"
 )
 
+const REQUEST_CLIENT = "TENCENTCLOUD_API_REQUEST_CLIENT"
+
 var ReqClient = "Terraform-latest"
 
 func SetReqClient(name string) {
@@ -35,6 +38,11 @@ func (me *LogRoundTripper) RoundTrip(request *http.Request) (response *http.Resp
 		return
 	}
 	var headName = "X-TC-Action"
+
+	if envReqClient := os.Getenv(REQUEST_CLIENT); envReqClient != "" {
+		ReqClient = envReqClient
+	}
+
 	request.Header.Set("X-TC-RequestClient", ReqClient)
 	inBytes = []byte(fmt.Sprintf("%s, request: ", request.Header[headName]))
 	requestBody, errRet := ioutil.ReadAll(bodyReader)