utilize latest go sdk to ensure createVolume idempotency

[AndyXiangLi]

Is this a bug fix or adding new feature?
Fixes #165

What is this PR about? / Why do we need it?
EBS team has updated the createVolume api to accept ClientToken in the createVolume request. doc here
With ClientToken, EBS will be able to ensure the createVolume Idempotency at Api level.
What testing is done?
unit test
sanity test
Manually tested described in the original re-produce step and observed only one volume is created

csc controller create-volume -e <endpoint> --cap 1,1 xiang-test --req-bytes 1024000 & \
> csc controller create-volume -e <endpoint> --cap 1,1 xiang-test --req-bytes 1024000
[1] 2801280
Create volume request for xiang-test is already in progress

Please use -h,--help for more information
"vol-0c8323ca0f9ab1a6d"	1073741824

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