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HostTemplate in hostname_handler now also supports the ${LOCATION}
variable to be resolved to the location set in the policy.
This will lead to a dhcp hostname supporting the location
autoresolution.

R=marcgrimme

Bug: 1013220
Change-Id: Iac87db9914985ce3a65c34607977cc4b9d663ea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915760Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Marc Grimme <marcgrimme@google.com>
Cr-Commit-Position: refs/heads/master@{#715702}