Use apt git package instead of git-core.
Use apt git package instead of git-core.

The git-core package is deprecated in favor of the git package. Use the
git package instead.

Change-Id: Ib136e34c7a0d4f87b02e32996420b3f507ca0bf4

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