Trap iscsiadm error
Trap iscsiadm error

If the iscsitarget was previously deleted and the user tries
to delete the iscsi target again, then you get a nasty traceback
in the logfiles.

According to the iscsiadm man page, iscsiadm returns an error 21,
ISCSI_ERR_NO_OBJS_FOUND if there is no records/targets/sessions/portals
found to execute the operation on.

LP: #1011166

Change-Id: I3087c1a114fe91bd7361d92688d4f926bc3f8951
Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

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