[PATCH] Add ability to disable hook scripts

Cherry-picked from
https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/i
aster/net-misc/dhcpcd/files/patches/dhcpcd-6.8.2-Add-ability-to-disable-
hook-scripts.patch.

This allow dhcpcd to be installed without hook scripts and bypassing
the hook script processing code.

BUG: 22956197
Change-Id: I47177410ac4516a0df27277f251f1ae0d632d770

Reviewed-on: https://chromium-review.googlesource.com/272614
3 files changed