Fix verify_tempest_config to not leak a tenant
Fix verify_tempest_config to not leak a tenant

When admin was available with tenant isolation, this script was
creating an isolated tenant but not clearing it.

Change-Id: Ie87cd3902ee645de173f50838e6df9a1ff4eb534

xbezdick/tempest,yamt/tempest,tudorvio/tempest,masayukig/tempest,xbezdick/tempest,sebrandon1/tempest,redhat-cip/tempest,Juniper/tempest,roopali8/tempest,eggmaster/tempest,manasi24/tempest,pandeyop/tempest,alinbalutoiu/tempest,yamt/tempest,pczerkas/tempest,Juraci/tempest,rakeshmi/tempest,manasi24/tempest,Tesora/tesora-tempest,NexusIS/tempest,manasi24/jiocloud-tempest-qatempest,tudorvio/tempest,neerja28/Tempest,vedujoshi/tempest,nunogt/tempest,bigswitch/tempest,danielmellado/tempest,LIS/lis-tempest,masayukig/tempest,jaspreetw/tempest,roopali8/tempest,hayderimran7/tempest,izadorozhna/tempest,cisco-openstack/tempest,openstack/tempest,nunogt/tempest,Juniper/tempest,jaspreetw/tempest,tonyli71/tempest,tonyli71/tempest,afaheem88/tempest,afaheem88/tempest,pandeyop/tempest,Juraci/tempest,eggmaster/tempest,LIS/lis-tempest,flyingfish007/tempest,cisco-openstack/tempest,Tesora/tesora-tempest,neerja28/Tempest,JioCloud/tempest,flyingfish007/tempest,sebrandon1/tempest,akash1808/tempest,dkalashnik/tempest,vedujoshi/tempest,openstack/tempest,manasi24/jiocloud-tempest-qatempest,rakeshmi/tempest,NexusIS/tempest,izadorozhna/tempest,varunarya10/tempest,bigswitch/tempest,pczerkas/tempest,zsoltdudas/lis-tempest,akash1808/tempest,danielmellado/tempest,varunarya10/tempest,redhat-cip/tempest,alinbalutoiu/tempest,hayderimran7/tempest,dkalashnik/tempest,zsoltdudas/lis-tempest,JioCloud/tempest