libvirt: remove VIF driver classes deprecated in Icehouse
libvirt: remove VIF driver classes deprecated in Icehouse

In Icehouse the old VIF driver classes were set as deprecated
to be removed in Juno. Now they can be finally deleted.

Related-bug: #1302796
Change-Id: I7be735062e6cc6aa54dec1bf43d3cce1ac544988

gooddata/openstack-nova,saleemjaveds/https-github.com-openstack-nova,iuliat/nova,mandeepdhami/nova,rahulunair/nova,berrange/nova,mahak/nova,NeCTAR-RC/nova,MountainWei/nova,cyx1231st/nova,CEG-FYP-OpenStack/scheduler,Yusuke1987/openstack_template,ted-gould/nova,edulramirez/nova,blueboxgroup/nova,ruslanloman/nova,vmturbo/nova,yatinkumbhare/openstack-nova,joker946/nova,gooddata/openstack-nova,rahulunair/nova,adelina-t/nova,LoHChina/nova,bgxavier/nova,zhimin711/nova,mgagne/nova,tealover/nova,dims/nova,kimjaejoong/nova,orbitfp7/nova,klmitch/nova,MountainWei/nova,TwinkleChawla/nova,vmturbo/nova,rajalokan/nova,BeyondTheClouds/nova,Stavitsky/nova,eonpatapon/nova,CEG-FYP-OpenStack/scheduler,mahak/nova,Tehsmash/nova,affo/nova,bgxavier/nova,mmnelemane/nova,whitepages/nova,mikalstill/nova,cloudbase/nova,rahulunair/nova,Juniper/nova,Tehsmash/nova,orbitfp7/nova,CloudServer/nova,sebrandon1/nova,devendermishrajio/nova_test_latest,dawnpower/nova,maelnor/nova,angdraug/nova,angdraug/nova,devendermishrajio/nova,zaina/nova,devendermishrajio/nova,devendermishrajio/nova_test_latest,JioCloud/nova,akash1808/nova_test_latest,CloudServer/nova,isyippee/nova,Juniper/nova,double12gzh/nova,zzicewind/nova,JianyuWang/nova,shail2810/nova,bigswitch/nova,zhimin711/nova,maelnor/nova,kimjaejoong/nova,cernops/nova,berrange/nova,tianweizhang/nova,cloudbase/nova,joker946/nova,virtualopensystems/nova,jianghuaw/nova,isyippee/nova,eayunstack/nova,JioCloud/nova,cyx1231st/nova,cloudbase/nova-virtualbox,Juniper/nova,apporc/nova,mmnelemane/nova,zzicewind/nova,NeCTAR-RC/nova,tangfeixiong/nova,varunarya10/nova_test_latest,alvarolopez/nova,raildo/nova,silenceli/nova,bigswitch/nova,hanlind/nova,sebrandon1/nova,openstack/nova,cloudbase/nova-virtualbox,Juniper/nova,thomasem/nova,affo/nova,felixma/nova,scripnichenko/nova,mikalstill/nova,takeshineshiro/nova,dims/nova,cernops/nova,ted-gould/nova,eonpatapon/nova,vladikr/nova_drafts,eayunstack/nova,viggates/nova,thomasem/nova,hanlind/nova,badock/nova,ruslanloman/nova,cernops/nova,vladikr/nova_drafts,alexandrucoman/vbox-nova-driver,nikesh-mahalka/nova,jianghuaw/nova,fnordahl/nova,jeffrey4l/nova,tealover/nova,alexandrucoman/vbox-nova-driver,noironetworks/nova,yosshy/nova,watonyweng/nova,whitepages/nova,openstack/nova,belmiromoreira/nova,BeyondTheClouds/nova,double12gzh/nova,barnsnake351/nova,rajalokan/nova,j-carpentier/nova,yosshy/nova,rajalokan/nova,jianghuaw/nova,projectcalico/calico-nova,zaina/nova,virtualopensystems/nova,JioCloud/nova_test_latest,rajalokan/nova,mandeepdhami/nova,redhat-openstack/nova,JianyuWang/nova,fnordahl/nova,alaski/nova,apporc/nova,Metaswitch/calico-nova,iuliat/nova,silenceli/nova,akash1808/nova,felixma/nova,petrutlucian94/nova,shail2810/nova,CCI-MOC/nova,watonyweng/nova,mahak/nova,noironetworks/nova,gooddata/openstack-nova,openstack/nova,tangfeixiong/nova,takeshineshiro/nova,klmitch/nova,vmturbo/nova,tianweizhang/nova,Francis-Liu/animated-broccoli,Metaswitch/calico-nova,raildo/nova,varunarya10/nova_test_latest,phenoxim/nova,Francis-Liu/animated-broccoli,adelina-t/nova,nikesh-mahalka/nova,gooddata/openstack-nova,TwinkleChawla/nova,tudorvio/nova,klmitch/nova,hanlind/nova,Yusuke1987/openstack_template,cloudbase/nova,projectcalico/calico-nova,alvarolopez/nova,edulramirez/nova,tudorvio/nova,dawnpower/nova,barnsnake351/nova,mgagne/nova,akash1808/nova,Stavitsky/nova,JioCloud/nova_test_latest,phenoxim/nova,redhat-openstack/nova,jianghuaw/nova,belmiromoreira/nova,LoHChina/nova,saleemjaveds/https-github.com-openstack-nova,viggates/nova,BeyondTheClouds/nova,j-carpentier/nova,yatinkumbhare/openstack-nova,CCI-MOC/nova,akash1808/nova_test_latest,klmitch/nova,jeffrey4l/nova,scripnichenko/nova,sebrandon1/nova,petrutlucian94/nova,vmturbo/nova,blueboxgroup/nova,badock/nova,alaski/nova,mikalstill/nova