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This is in preparation for adding UI to allow users
to set a custom DHCP hostname. Currently the policy
code is always setting the hostname, even if
kDeviceHostnameTemplate is not set by policy,
which overrides any other custom set hostname.

Bug: 1103272
Change-Id: Ia99ee58c59ae1f38e8fe10ed693997dead861c4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320991
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Omar Morsi <omorsi@google.com>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799393}