Add deleted_at to instance usage notification.
Add deleted_at to instance usage notification.

This makes it easier to determine the uptime of a particular instance.

Change-Id: If94d811b07120662ec3c8ce0a275f4c6178be56d

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