tweaks to cache warming, and better comments
tweaks to cache warming, and better comments

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