netboot: Fix missing /run/lock after chroot invokcation.

After flashrom and mosys have been changed to LFH we have to make sure
/run and /run/lock are both preserved (or re-created) after chroot
calls.

BUG=chrome-os-partner:51705,chrome-os-partner:52038,chromium:591366
TEST=./build_packages --board=${BOARD}
     ./make_netboot.sh --board=${BOARD} --image_dir=/tmp
     # use /tmp/netboot/vmlinux.bin for netboot kernel.

Change-Id: I32aafc94c5558828c34457d688710051adf0e16d
Reviewed-on: https://chromium-review.googlesource.com/337490
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Liu Bo <boliu@yifangdigital.com>
Reviewed-by: Shun-Hsing Ou <shunhsingou@chromium.org>
1 file changed