R1:4cae4a3b767f

Correct `bin/storage analyze` internal API for cluster environments

Summary:
Ref T12819. This worked right in a non-cluster environment, but `bin/storage upgrade` iterates over each master in a partitioned cluster environment.

Tweak the API so `bin/storage analyze` targets a single host but `bin/storage upgrade` can hit all the masters.

Test Plan: Will run `bin/storage upgrade` in production again. Ran `upgrade` and `analyze` locally, still work fine.

Reviewers: chad

Reviewed By: chad

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