Make sure not to revert local changes.
Make sure not to revert local changes.

"git diff --quiet" has a bug ignoring local changes if there's a
unchanged file with a newer timestamp.  This patch works around
the bug.

Change-Id: I0ddc24e0f7af21287c43c1e04dd166ebff6f2dca
Closes-Bug: 1264422

TwinkleChawla/devstack,costingalan/devstack,kplus/devstack-moonshot,rushiagr/devstack,sequenceiq/devstack,promptworks/devstack,bswartz/devstack,jamielennox/devstack,nuxeh/devstack,NaokiMiyata/devstack,sequenceiq/devstack,pczerkas/devstack,parul24/devstack,olivierlemasle/devstack,group-policy/devstack,andrewrothstein/devstack,BSJAIN92/OpenStack,avvocatodemarchis/devstack,kplus/devstack-moonshot,costingalan/devstack,upadhyay-prashant/devstack,mssumanth/devstack,Mahito/devstack,prithivm/branch01,prithivm/branch01,eharney/devstack,liuquansheng47/devstack,sc68cal/devstack,BSJAIN92/OpenStack,flavio-fernandes/devstack,affo/devstack,varunarya10/devstack,openstack-dev/devstack,wenhuizhang/devstack,atulpatil301/devstack,eharney/devstack,rushiagr/devstack,vsham20/devstack,sc68cal/devstack,samgoon/devstack,bq-xiao/devstack,HPCHub/devstack,nawawi/openstack,upadhyay-prashant/devstack,mssumanth/devstack,j4/devstack,atulpatil301/devstack,flavio-fernandes/devstack,j4/devstack,CloudServer/devstack,TwinkleChawla/devstack,pczerkas/devstack,vishnugonela/devstack,Millnert/contrail-devstack,eshnil2000/devstack,neerja28/Devstack_GlusterFS,parul24/devstack,JioCloud/devstack,virtualopensystems/devstack,mc2014/devstack,williamthegrey/devstack,LoHChina/devstack,thomasem/devstack,pombredanne/devstack,affo/devstack,herrsechs/devstack,CloudServer/devstack,Juniper/devstack,mmasaki/devstack,innodee/openstackk,ozamiatin/devstack,NaokiMiyata/devstack,varunarya10/devstack,mmasaki/devstack,HPCHub/devstack,liuquansheng47/devstack,neerja28/Devstack_GlusterFS,tianweizhang/devstack,avvocatodemarchis/devstack,dirkmueller/devstack,Mahito/devstack,dirkmueller/devstack,vsham20/devstack,vishnugonela/devstack,pacinete/devstack,bljgaurav/openstack-test,thomasem/devstack,bq-xiao/devstack,wenhuizhang/devstack,tianweizhang/devstack,pombredanne/devstack,herrsechs/devstack,bigswitch/devstack,noironetworks/devstack,promptworks/devstack,andrewrothstein/devstack,nawawi/openstack,dtroyer/devstack,pacinete/devstack,richliu/devstack,openstack-dev/devstack,noironetworks/devstack,mc2014/devstack,bljgaurav/openstack-test,bswartz/devstack,LoHChina/devstack,olivierlemasle/devstack,nuxeh/devstack,group-policy/devstack,ozamiatin/devstack,bigswitch/devstack,richliu/devstack,samgoon/devstack,dtroyer/devstack,srics/devstack