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Add support for the forced initial enrollment check in
AutoEnrollmentClient. This check uses a different identifier set, 8 byte
hashes and a different message for the state download.
The differences are abstracted by using two virtual classes with
different implementations for FRE/initial enrollment checks:
DeviceIdentifierProvider specifies the identifier set and hashes, and
StateDownloadMessageProcessor understands fills state download requests
and parses state download responses.

Bug: 839353
Test: unit_tests --gtest_filter=*AutoEnrollmentClientTest*
Change-Id: I83d041f568d84c42b9b8cf00a1e44955f9d5abe3
Reviewed-on: https://chromium-review.googlesource.com/1049929
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557627}