Add volume snapshot APIs to driver interface
Add volume snapshot APIs to driver interface

Add volume_snapshot_create and volume_snapshot_delete to the virt driver
interface.  This is needed to be able to do hypervisor assisted snapshot
operations.

Part of blueprint qemu-assisted-snapshots

Change-Id: I933e000ee56430365f9e380196714f43a85f147f

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