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
Maniphest Tasks: T12819
Differential Revision: https://secure.phabricator.com/D18576