Use sudo+virsh to clean instances frm previous run
Use sudo+virsh to clean instances frm previous run

 * fixes bug 955782

Change-Id: I8868132d5e18908d309da025760582a778ab4e72

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