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There are some device protos which have the same field names (e.g. enabled).
Currently the policy_server cannot differentiate between them. This will
all setting these by: "groupname.fieldname", e.g:
"device_power_peak_shift.enabled".

TEST=Locally deployed and tested
BUG=TBD

Change-Id: I9565f3082ed192e787b2a00efec1ae29ebe195f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790534Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Derek Beckett <dbeckett@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694856}