Regenerate tempest.conf every time
Regenerate tempest.conf every time

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If we don't do this, repeat devstack installs won't be
able to use this script.

Change-Id: I95746ffebfa7163c80161d26de1e575c0fc5d39c

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