Allow different paths for deploy-helper helpers.
Allow different paths for deploy-helper helpers.

Different distros (or even distro releases) put iscsiadm in potentially
arbitrary paths. It is better to use rootwraps' own search than to hardcode the
path.

Fixes bug 1178612

Change-Id: I690788b666a84e599504690d0e2d087eaa66a4c8

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