add snapshot id and huawei client for csbs

[Savasw]

What this PR does / why we need it:This PR adds snapshot id parameter for volume metadata in response and Huawei client for csbs

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[coveralls]

Pull Request Test Coverage Report for Build 225

• 0 of 8 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 69.689%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
openstack/client.go	0	8	0.0%

Totals
Change from base Build 220:	-0.03%
Covered Lines:	11252
Relevant Lines:	16146

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 233

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 75.155%

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Totals
Change from base Build 232:	0.0%
Covered Lines:	5445
Relevant Lines:	7245

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💛 - Coveralls

[zengchen1024]

please fix the conficting first. then I will merge it. Thanks

[Savasw]

@zengchen1024 Done