ebs: Adjust timeout for EBS
ebs: Adjust timeout for EBS

Refer to https://github.com/aws/aws-sdk-go/issues/364 , we'd better not to
retry too fast for AWS API.

medallia/convoy,nickvanw/convoy,rancher/rancher-volume,rancherio/rancher-volume,nickvanw/convoy,rancher/rancher-volume,medallia/convoy,rancher/convoy,aruneli/convoy,rancherio/volmgr,jinuxstyle/convoy,rancher/rancher-volume,jinuxstyle/convoy,jinuxstyle/convoy,medallia/convoy,rancher/convoy,rancherio/rancher-volume,nickvanw/convoy,aruneli/convoy,rancherio/rancher-volume,aruneli/convoy,rancherio/volmgr,rancherio/volmgr,rancher/convoy