Deprecate old vif drivers.
Deprecate old vif drivers.

As per commit 4c0cecd3 (Change-Id I292c2fd7aa0c32b1c91d737152ed8e54ea2cf6ac)
Deprecate:
* LibvirtBridgeDriver
* LibvirtOpenVswitchDriver
* LibvirtHybridOVSBridgeDriver
* LibvirtOpenVswitchVirtualPortDriver
* QuantumLinuxBridgeVIFDriver

Change-Id: Iad854dfe91aaa18622f78aa92746d3ea2f986960

mahak/nova,tianweizhang/nova,shail2810/nova,silenceli/nova,thomasem/nova,badock/nova,tianweizhang/nova,imsplitbit/nova,cernops/nova,edulramirez/nova,felixma/nova,rajalokan/nova,imsplitbit/nova,hanlind/nova,alexandrucoman/vbox-nova-driver,qwefi/nova,takeshineshiro/nova,bigswitch/nova,jianghuaw/nova,petrutlucian94/nova_dev,qwefi/nova,gooddata/openstack-nova,openstack/nova,apporc/nova,NeCTAR-RC/nova,mikalstill/nova,eayunstack/nova,fnordahl/nova,rrader/nova-docker-plugin,NeCTAR-RC/nova,orbitfp7/nova,berrange/nova,Tehsmash/nova,adelina-t/nova,cloudbase/nova,luogangyi/bcec-nova,isyippee/nova,sridevikoushik31/nova,Metaswitch/calico-nova,projectcalico/calico-nova,Yuriy-Leonov/nova,eharney/nova,double12gzh/nova,CloudServer/nova,affo/nova,gooddata/openstack-nova,mikalstill/nova,cyx1231st/nova,akash1808/nova_test_latest,bclau/nova,alaski/nova,zaina/nova,CEG-FYP-OpenStack/scheduler,zhimin711/nova,plumgrid/plumgrid-nova,sridevikoushik31/nova,phenoxim/nova,openstack/nova,TwinkleChawla/nova,klmitch/nova,klmitch/nova,OpenAcademy-OpenStack/nova-scheduler,redhat-openstack/nova,Yusuke1987/openstack_template,CEG-FYP-OpenStack/scheduler,DirectXMan12/nova-hacking,j-carpentier/nova,rajalokan/nova,klmitch/nova,bclau/nova,mandeepdhami/nova,alvarolopez/nova,Yusuke1987/openstack_template,CCI-MOC/nova,zhimin711/nova,mgagne/nova,petrutlucian94/nova,cloudbau/nova,MountainWei/nova,zzicewind/nova,shahar-stratoscale/nova,nikesh-mahalka/nova,cyx1231st/nova,BeyondTheClouds/nova,DirectXMan12/nova-hacking,tangfeixiong/nova,virtualopensystems/nova,mikalstill/nova,cernops/nova,joker946/nova,Tehsmash/nova,sridevikoushik31/nova,saleemjaveds/https-github.com-openstack-nova,devoid/nova,eayunstack/nova,SUSE-Cloud/nova,orbitfp7/nova,redhat-openstack/nova,TieWei/nova,vladikr/nova_drafts,felixma/nova,mahak/nova,LoHChina/nova,cernops/nova,sacharya/nova,Stavitsky/nova,yosshy/nova,gooddata/openstack-nova,blueboxgroup/nova,thomasem/nova,JianyuWang/nova,jeffrey4l/nova,apporc/nova,blueboxgroup/nova,projectcalico/calico-nova,dawnpower/nova,vmturbo/nova,JioCloud/nova_test_latest,leilihh/nova,rahulunair/nova,iuliat/nova,bgxavier/nova,vmturbo/nova,whitepages/nova,vladikr/nova_drafts,luogangyi/bcec-nova,ntt-sic/nova,TwinkleChawla/nova,Stavitsky/nova,angdraug/nova,MountainWei/nova,ruslanloman/nova,belmiromoreira/nova,affo/nova,rajalokan/nova,zaina/nova,klmitch/nova,TieWei/nova,petrutlucian94/nova,spring-week-topos/nova-week,nikesh-mahalka/nova,silenceli/nova,cloudbase/nova,rickerc/nova_audit,citrix-openstack-build/nova,dims/nova,leilihh/nova,jianghuaw/nova,eharney/nova,hanlind/nova,CiscoSystems/nova,sridevikoushik31/nova,angdraug/nova,akash1808/nova,hanlind/nova,rahulunair/nova,Metaswitch/calico-nova,devendermishrajio/nova,Juniper/nova,noironetworks/nova,leilihh/novaha,mgagne/nova,Juniper/nova,sebrandon1/nova,tanglei528/nova,phenoxim/nova,mmnelemane/nova,fnordahl/nova,shail2810/nova,shootstar/novatest,akash1808/nova,tealover/nova,tudorvio/nova,raildo/nova,ruslanloman/nova,spring-week-topos/nova-week,Brocade-OpenSource/OpenStack-DNRM-Nova,isyippee/nova,JianyuWang/nova,tudorvio/nova,yosshy/nova,petrutlucian94/nova_dev,scripnichenko/nova,joker946/nova,shootstar/novatest,j-carpentier/nova,cloudbase/nova,whitepages/nova,watonyweng/nova,mmnelemane/nova,sebrandon1/nova,openstack/nova,eonpatapon/nova,scripnichenko/nova,dims/nova,dawnpower/nova,yatinkumbhare/openstack-nova,cloudbase/nova-virtualbox,yatinkumbhare/openstack-nova,ntt-sic/nova,devendermishrajio/nova_test_latest,devoid/nova,vmturbo/nova,sebrandon1/nova,tealover/nova,devendermishrajio/nova,ted-gould/nova,rickerc/nova_audit,zzicewind/nova,mahak/nova,Francis-Liu/animated-broccoli,eonpatapon/nova,tangfeixiong/nova,CCI-MOC/nova,viggates/nova,watonyweng/nova,bigswitch/nova,cloudbase/nova-virtualbox,iuliat/nova,shahar-stratoscale/nova,akash1808/nova_test_latest,maelnor/nova,jianghuaw/nova,barnsnake351/nova,JioCloud/nova,CiscoSystems/nova,virtualopensystems/nova,SUSE-Cloud/nova,citrix-openstack-build/nova,tanglei528/nova,saleemjaveds/https-github.com-openstack-nova,cloudbau/nova,noironetworks/nova,varunarya10/nova_test_latest,kimjaejoong/nova,devendermishrajio/nova_test_latest,mandeepdhami/nova,BeyondTheClouds/nova,leilihh/novaha,alvarolopez/nova,raildo/nova,rrader/nova-docker-plugin,barnsnake351/nova,plumgrid/plumgrid-nova,sacharya/nova,gooddata/openstack-nova,jianghuaw/nova,DirectXMan12/nova-hacking,CloudServer/nova,takeshineshiro/nova,rahulunair/nova,varunarya10/nova_test_latest,BeyondTheClouds/nova,OpenAcademy-OpenStack/nova-scheduler,viggates/nova,belmiromoreira/nova,berrange/nova,badock/nova,ewindisch/nova,vmturbo/nova,bgxavier/nova,Yuriy-Leonov/nova,JioCloud/nova_test_latest,alexandrucoman/vbox-nova-driver,Juniper/nova,rajalokan/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,ewindisch/nova,kimjaejoong/nova,JioCloud/nova,Francis-Liu/animated-broccoli,LoHChina/nova,ted-gould/nova,maelnor/nova,double12gzh/nova,Juniper/nova,jeffrey4l/nova,alaski/nova,adelina-t/nova,edulramirez/nova