Remove powervm nova virt driver support
Remove powervm nova virt driver support

The powervm virt driver was removed from nova in a
recent change. This functionality is no longer needed in
devstack.

Change-Id: Iec620938a8cce63e0830fc7b9e9a679b361b4389

bigswitch/devstack,ozamiatin/devstack,vsham20/devstack,herrsechs/devstack,dtroyer/devstack,BSJAIN92/OpenStack,liuquansheng47/devstack,CloudServer/devstack,sequenceiq/devstack,andrewrothstein/devstack,mssumanth/devstack,varunarya10/devstack,thomasem/devstack,nawawi/openstack,j4/devstack,parul24/devstack,pombredanne/devstack,TwinkleChawla/devstack,NaokiMiyata/devstack,eshnil2000/devstack,CloudServer/devstack,pczerkas/devstack,eharney/devstack,samgoon/devstack,promptworks/devstack,JioCloud/devstack,pacinete/devstack,Millnert/contrail-devstack,bljgaurav/openstack-test,Juniper/devstack,openstack-dev/devstack,rushiagr/devstack,atulpatil301/devstack,mmasaki/devstack,mc2014/devstack,Mahito/devstack,dirkmueller/devstack,nuxeh/devstack,prithivm/branch01,group-policy/devstack,sc68cal/devstack,neerja28/Devstack_GlusterFS,eharney/devstack,prithivm/branch01,upadhyay-prashant/devstack,bq-xiao/devstack,andrewrothstein/devstack,bq-xiao/devstack,vishnugonela/devstack,wenhuizhang/devstack,pacinete/devstack,costingalan/devstack,liuquansheng47/devstack,vishnugonela/devstack,bigswitch/devstack,sequenceiq/devstack,sc68cal/devstack,srics/devstack,NaokiMiyata/devstack,varunarya10/devstack,nuxeh/devstack,vsham20/devstack,kplus/devstack-moonshot,bswartz/devstack,kplus/devstack-moonshot,jamielennox/devstack,rushiagr/devstack,wenhuizhang/devstack,parul24/devstack,group-policy/devstack,ozamiatin/devstack,mc2014/devstack,richliu/devstack,openstack-dev/devstack,promptworks/devstack,bswartz/devstack,neerja28/Devstack_GlusterFS,pczerkas/devstack,williamthegrey/devstack,avvocatodemarchis/devstack,nawawi/openstack,richliu/devstack,costingalan/devstack,dirkmueller/devstack,mssumanth/devstack,affo/devstack,TwinkleChawla/devstack,virtualopensystems/devstack,LoHChina/devstack,HPCHub/devstack,olivierlemasle/devstack,dtroyer/devstack,noironetworks/devstack,mmasaki/devstack,noironetworks/devstack,avvocatodemarchis/devstack,olivierlemasle/devstack,atulpatil301/devstack,flavio-fernandes/devstack,innodee/openstackk,flavio-fernandes/devstack,upadhyay-prashant/devstack,affo/devstack,yamt/devstack,tianweizhang/devstack,thomasem/devstack,bljgaurav/openstack-test,HPCHub/devstack,pombredanne/devstack,j4/devstack,herrsechs/devstack,BSJAIN92/OpenStack,tianweizhang/devstack,samgoon/devstack,Mahito/devstack,LoHChina/devstack