fix aws sdk session (kubernetes-sigs#1508)

Author: M00nF1sh

pkg/aws/cloud.go

@@ -73,8 +73,8 @@ func NewCloud(cfg CloudConfig, metricsRegisterer prometheus.Registerer) (Cloud,
 		cfg.VpcID = vpcId
 	}
 
-	awsCfg := aws.NewConfig().WithRegion(cfg.Region).WithSTSRegionalEndpoint(endpoints.RegionalSTSEndpoint).WithMaxRetries(cfg.MaxRetries)
-	sess = sess.Copy(awsCfg)
+	awsCFG := aws.NewConfig().WithRegion(cfg.Region).WithSTSRegionalEndpoint(endpoints.RegionalSTSEndpoint).WithMaxRetries(cfg.MaxRetries)
+	sess = session.Must(session.NewSession(awsCFG))
 	return &defaultCloud{
 		cfg:         cfg,
 		ec2:         services.NewEC2(sess),