Merge branch 'session_refactor' into 'master'

feat: 优化errorCode报错, status code统一200

See merge request iesqa/httprunner!112

server/model.go

@@ -1,7 +1,7 @@
 package server
 
 type HttpResponse struct {
-	Code    int         `json:"code"`
+	Code    int         `json:"errorCode"`
 	Message string      `json:"message"`
 	Result  interface{} `json:"result,omitempty"`
 }

uixt/driver_session.go

@@ -46,7 +46,7 @@ func NewDriverSession() *DriverSession {
 		client: &http.Client{
 			Timeout: timeout,
 		},
-		maxRetry: 5,
+		maxRetry: 1,
 	}
 	session.Reset()
 	return session