Support new allow_tenant_reuse parameter in tempest config
Support new allow_tenant_reuse parameter in tempest config

This adds support for setting the above-mentioned attribute, which
was added in tempest recently.

Change-Id: I14fe21f97d1c57f538254fa0420e9bc56115fc3b

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