versions: image: Update base os to version 20640
versions: image: Update base os to version 20640

Changes in package coreutils (from 8.28-41 to 8.29-42):
Arjan van de Ven - coreutils: Autospec creation for update from
version 8.28 to version 8.29
https://download.clearlinux.org/releases/19960/clear/RELEASENOTES

Changes in package systemd (from 234-158 to 234-159):
Auke Kok - Allow timesyncd to restart after a
software update.
https://download.clearlinux.org/releases/20480/clear/RELEASENOTES

Changes in package coreutils (from 8.29-42 to 8.29-43):
Victor Rodriguez - coreutils:
    Fix forCVE-2017-18018 CVE-2017-18018-1
Patrick McCarty - Add giturl
https://download.clearlinux.org/releases/20490/clear/RELEASENOTES

Changes in package systemd (from 234-159 to 234-160):
Simental Magana, Marcos - Fix rejected send message by D-Bus from
logind
https://download.clearlinux.org/releases/20620/clear/RELEASENOTES

Fixes #979

Signed-off-by: Jose Carlos Venegas Munoz <821ab150128e889cb3ad9aab6e72689fd9ad26f2@intel.com>

clearcontainers/runtime,chavafg/runtime,chavafg/runtime,clearcontainers/runtime,devimc/runtime,devimc/runtime