update hooks: 3c1d3d8be6f0f8b3cc34fb762f997b39d4cc9c36, take two
update hooks: 3c1d3d8be6f0f8b3cc34fb762f997b39d4cc9c36, take two

add a hook for fixing all pending config updates

BUG=chromium-os:13987
TEST=below
1) export CONFIG_PROTECT="/etc /usr/share"
2) checkout as old as possible revision of cros-overlay, update chroot to it
3) checkout HEAD and update back
4) run the hook, see it update thousands of files correctly

Change-Id: Idabf5475516ed58b76ceee6ffdc817a5f46839ad
Reviewed-on: http://gerrit.chromium.org/gerrit/10022
Reviewed-by: Sameer Nanda <3daf6939ed4518939423e49b8a1025b098597787@chromium.org>
Tested-by: Zdenek Behan <483cf2a9a4e071d4fd973db6a5a78c40f490667c@chromium.org>

gtank/scripts,andrejro/coreos--scripts,sigma/coreos-scripts,marineam/coreos-scripts,endocode/scripts,crawford/scripts,mischief/scripts,mischief/scripts,gtank/scripts,coreos/scripts,fivethreeo/scripts,vmware/coreos-scripts,sigma/coreos-scripts,endocode/scripts,mjg59/scripts,coreos/scripts,BugRoger/scripts,mischief/scripts,smilart/scripts,smilart/scripts,bcwaldon/coreos-scripts,fivethreeo/scripts,nicescale/scripts,andrejro/coreos--scripts,trnubo/scripts,glevand/coreos--scripts,marineam/coreos-scripts,mjg59/scripts,smilart/scripts,gtank/scripts,sigma/coreos-scripts,bcwaldon/coreos-scripts,endocode/scripts,zhang0137/scripts,crawford/scripts,glevand/coreos--scripts,nicescale/scripts,zhang0137/scripts,nicescale/scripts,mjg59/scripts,andrejro/coreos--scripts,vmware/coreos-scripts,crawford/scripts,trnubo/scripts,marineam/coreos-scripts,vmware/coreos-scripts,BugRoger/scripts,bcwaldon/coreos-scripts,zhang0137/scripts,fivethreeo/scripts,trnubo/scripts,BugRoger/scripts