Enable Azure snapshot plugin to support taking snapshot into multiple storage accounts.#22709

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JeffreyZZ wants to merge 2 commits intoelastic:masterfrom JeffreyZZ:master

+137-35

Commits on Jan 8, 2017

Update blobstore, service and settings files to support multiple storage accounts
Jeffrey Zhou
committed

Commits on Jan 20, 2017

Enable exponential retry for Azure storage access.
Jeffrey Zhou
committed