Ensure hairpin_mode is set whenever vifs is added to bridge.
Ensure hairpin_mode is set whenever vifs is added to bridge.

Fix the bug that when create a snapshot of an instance, the
instance cann't ping it's floating ip.
fix bug lp:1040537

Change-Id: I25aa1a323fa84e8c72f969cb56ada4dffa509150

thomasem/nova,rickerc/nova_audit,varunarya10/nova_test_latest,gspilio/nova,tealover/nova,devoid/nova,tianweizhang/nova,virtualopensystems/nova,vmturbo/nova,eonpatapon/nova,rajalokan/nova,shail2810/nova,hanlind/nova,Juniper/nova,noironetworks/nova,alaski/nova,Metaswitch/calico-nova,ntt-sic/nova,akash1808/nova,mmnelemane/nova,jeffrey4l/nova,Tehsmash/nova,jianghuaw/nova,aristanetworks/arista-ovs-nova,usc-isi/nova,maheshp/novatest,barnsnake351/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,alaski/nova,silenceli/nova,paulmathews/nova,JioCloud/nova_test_latest,dims/nova,cloudbase/nova-virtualbox,alexandrucoman/vbox-nova-driver,badock/nova,tudorvio/nova,felixma/nova,maoy/zknova,watonyweng/nova,alexandrucoman/vbox-nova-driver,devendermishrajio/nova_test_latest,redhat-openstack/nova,watonyweng/nova,sridevikoushik31/nova,Triv90/Nova,badock/nova,JianyuWang/nova,qwefi/nova,sebrandon1/nova,tangfeixiong/nova,leilihh/novaha,shahar-stratoscale/nova,blueboxgroup/nova,imsplitbit/nova,virtualopensystems/nova,tealover/nova,jeffrey4l/nova,joker946/nova,affo/nova,varunarya10/nova_test_latest,alvarolopez/nova,nikesh-mahalka/nova,shootstar/novatest,CiscoSystems/nova,viggates/nova,TwinkleChawla/nova,edulramirez/nova,vladikr/nova_drafts,fajoy/nova,bigswitch/nova,Juniper/nova,yatinkumbhare/openstack-nova,bgxavier/nova,spring-week-topos/nova-week,isyippee/nova,noironetworks/nova,devendermishrajio/nova,LoHChina/nova,NeCTAR-RC/nova,berrange/nova,gspilio/nova,rickerc/nova_audit,cernops/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,edulramirez/nova,projectcalico/calico-nova,berrange/nova,eharney/nova,cloudbau/nova,shootstar/novatest,Yusuke1987/openstack_template,TieWei/nova,houshengbo/nova_vmware_compute_driver,sacharya/nova,BeyondTheClouds/nova,vmturbo/nova,raildo/nova,iuliat/nova,petrutlucian94/nova_dev,maheshp/novatest,isyippee/nova,sridevikoushik31/nova,shail2810/nova,hanlind/nova,Francis-Liu/animated-broccoli,sridevikoushik31/openstack,houshengbo/nova_vmware_compute_driver,MountainWei/nova,j-carpentier/nova,citrix-openstack-build/nova,dims/nova,tanglei528/nova,bgxavier/nova,petrutlucian94/nova,ted-gould/nova,rrader/nova-docker-plugin,double12gzh/nova,Stavitsky/nova,cloudbase/nova,orbitfp7/nova,felixma/nova,mgagne/nova,aristanetworks/arista-ovs-nova,bigswitch/nova,klmitch/nova,joker946/nova,dawnpower/nova,spring-week-topos/nova-week,rahulunair/nova,cloudbase/nova-virtualbox,mahak/nova,dstroppa/openstack-smartos-nova-grizzly,TwinkleChawla/nova,savi-dev/nova,fnordahl/nova,bclau/nova,CloudServer/nova,angdraug/nova,petrutlucian94/nova_dev,sridevikoushik31/nova,gooddata/openstack-nova,leilihh/nova,zhimin711/nova,zhimin711/nova,zaina/nova,plumgrid/plumgrid-nova,savi-dev/nova,redhat-openstack/nova,maelnor/nova,iuliat/nova,eayunstack/nova,plumgrid/plumgrid-nova,Triv90/Nova,gooddata/openstack-nova,rajalokan/nova,phenoxim/nova,Tehsmash/nova,yatinkumbhare/openstack-nova,takeshineshiro/nova,sridevikoushik31/nova,sridevikoushik31/openstack,cyx1231st/nova,NeCTAR-RC/nova,DirectXMan12/nova-hacking,DirectXMan12/nova-hacking,mmnelemane/nova,devendermishrajio/nova,eayunstack/nova,luogangyi/bcec-nova,klmitch/nova,usc-isi/nova,takeshineshiro/nova,aristanetworks/arista-ovs-nova,vmturbo/nova,jianghuaw/nova,paulmathews/nova,orbitfp7/nova,belmiromoreira/nova,CEG-FYP-OpenStack/scheduler,mikalstill/nova,SUSE-Cloud/nova,JioCloud/nova_test_latest,tanglei528/nova,eonpatapon/nova,double12gzh/nova,maoy/zknova,fajoy/nova,saleemjaveds/https-github.com-openstack-nova,maelnor/nova,petrutlucian94/nova,devoid/nova,Triv90/Nova,paulmathews/nova,cloudbase/nova,klmitch/nova,qwefi/nova,zaina/nova,savi-dev/nova,cernops/nova,JianyuWang/nova,yrobla/nova,ruslanloman/nova,mandeepdhami/nova,vladikr/nova_drafts,ted-gould/nova,BeyondTheClouds/nova,maoy/zknova,mahak/nova,CiscoSystems/nova,CloudServer/nova,houshengbo/nova_vmware_compute_driver,barnsnake351/nova,yosshy/nova,Stavitsky/nova,rrader/nova-docker-plugin,OpenAcademy-OpenStack/nova-scheduler,leilihh/nova,belmiromoreira/nova,fnordahl/nova,eharney/nova,gspilio/nova,bclau/nova,BeyondTheClouds/nova,kimjaejoong/nova,openstack/nova,ewindisch/nova,mahak/nova,tudorvio/nova,dstroppa/openstack-smartos-nova-grizzly,sebrandon1/nova,zzicewind/nova,thomasem/nova,gooddata/openstack-nova,silenceli/nova,ruslanloman/nova,scripnichenko/nova,angdraug/nova,nikesh-mahalka/nova,yrobla/nova,shahar-stratoscale/nova,Francis-Liu/animated-broccoli,raildo/nova,alvarolopez/nova,rajalokan/nova,DirectXMan12/nova-hacking,fajoy/nova,CEG-FYP-OpenStack/scheduler,JioCloud/nova,viggates/nova,akash1808/nova,sebrandon1/nova,NewpTone/stacklab-nova,rajalokan/nova,sridevikoushik31/openstack,jianghuaw/nova,blueboxgroup/nova,CCI-MOC/nova,OpenAcademy-OpenStack/nova-scheduler,adelina-t/nova,devendermishrajio/nova_test_latest,imsplitbit/nova,jianghuaw/nova,affo/nova,cloudbase/nova,kimjaejoong/nova,Yusuke1987/openstack_template,projectcalico/calico-nova,whitepages/nova,cernops/nova,dawnpower/nova,sacharya/nova,whitepages/nova,Yuriy-Leonov/nova,TieWei/nova,NewpTone/stacklab-nova,akash1808/nova_test_latest,mikalstill/nova,maheshp/novatest,LoHChina/nova,CCI-MOC/nova,hanlind/nova,mikalstill/nova,luogangyi/bcec-nova,akash1808/nova_test_latest,rahulunair/nova,tangfeixiong/nova,leilihh/novaha,scripnichenko/nova,ewindisch/nova,ntt-sic/nova,klmitch/nova,citrix-openstack-build/nova,openstack/nova,apporc/nova,SUSE-Cloud/nova,JioCloud/nova,adelina-t/nova,mgagne/nova,usc-isi/nova,zzicewind/nova,Yuriy-Leonov/nova,dstroppa/openstack-smartos-nova-grizzly,cyx1231st/nova,tianweizhang/nova,mandeepdhami/nova,yosshy/nova,cloudbau/nova,apporc/nova,NewpTone/stacklab-nova,saleemjaveds/https-github.com-openstack-nova,MountainWei/nova,rahulunair/nova,yrobla/nova,Metaswitch/calico-nova,vmturbo/nova,Juniper/nova,gooddata/openstack-nova,j-carpentier/nova,phenoxim/nova,Juniper/nova,openstack/nova