Add expected exception to aggregate_metadata_delete()
Add expected exception to aggregate_metadata_delete()

This adds a missing client_exceptions() decorator to the conductor's
aggregate_metadata_delete() method, which was missed due to the
timing of when the patches landed. With this, all expected exceptions
in conductor's current set of operations should be properly marked.

Related to bp/no-db-compute-manager

Change-Id: Ifa8cdcb1c7e93aeb95f5dc4fe2e294fe0165cdc5

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