Modify CloudPolicyClient to support multiple concurrent requests.

CloudPolicyClient previously only allowed a single outstanding request at once,
and issuing a new request would cause the previous request to silently fail.
This behavior made sense for policy fetches, but not for other types of
out-of-band requests (status uploads, certificate uploads, etc).

CloudPolicyClient now allows multiple requests at once, and differentiates
between policy-fetch/registration related requests and out-of-band requests.

BUG=452563

Review URL: https://codereview.chromium.org/885653007

Cr-Commit-Position: refs/heads/master@{#315084}

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