Update security_AccountsBaseline with 'dhcp' user and group.

BUG=chromium-os:28336
TEST=security_AccountsBaseline passes again.

Change-Id: I68e8142d385840707dd1368ee8508c288aecc425
Reviewed-on: https://gerrit.chromium.org/gerrit/21068
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Jim Hebert <jimhebert@chromium.org>
Commit-Ready: Jorge Lucangeli Obes <jorgelo@chromium.org>
2 files changed