Revert "apmanager: add firewall rule to allow dhcp traffics"

This reverts commit 1d974a1da8e21d32baee5397cca45d48073d6bb7.

x86-generic incremental is broken:

http://build.chromium.org/p/chromiumos/builders/x86-generic%20incremental/builds/21817

Change-Id: I7c2c5ad0bd12ee61c65c351e116804198c8c8d01
Reviewed-on: https://chromium-review.googlesource.com/237309
Reviewed-by: Steve Fung <stevefung@chromium.org>
Tested-by: Steve Fung <stevefung@chromium.org>
Tested-by: Thieu Le <thieule@chromium.org>
1 file changed