Add new ELB v1 client

[niuzhenguo]

What this PR does / why we need it:

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 263

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+5.3%) to 74.891%

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Totals
Change from base Build 257:	5.3%
Covered Lines:	5849
Relevant Lines:	7810

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 263

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+5.3%) to 74.891%

---

Totals
Change from base Build 257:	5.3%
Covered Lines:	5849
Relevant Lines:	7810

---

💛 - Coveralls