Fix exception reraising in volume manager.
Fix exception reraising in volume manager.

Change-Id: Id75bdd6531acf492df4c8d96723b8303406bffe0

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