Don't leak info from libvirt LVM backed instances
Don't leak info from libvirt LVM backed instances

* nova/virt/libvirt/utils.py (remove_logical_volumes):
Overwrite each logical volume with zero
(clear_logical_volume): LV obfuscation implementation.
(logical_volume_size): A utility function used by
clear_logical_volume()

Fixes bug: 1070539
Change-Id: I4e1024de8dfe9b0be3b0d6437c836d2042862f85

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