Workaround Fedora libvirtd issues on Xen instances
Workaround Fedora libvirtd issues on Xen instances

Fedora libvirtd fails to start on Xen instances (i.e. rackspace
instances) due to [1].  This works around the issue until it can be
fixed upstream.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1098376

Change-Id: I3790b5025982730263a6a84fce596e80f09efd5a

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