Use OSError instead of ProcessExecutionError.
Use OSError instead of ProcessExecutionError.

This patch updates the ZeroMQ test module to use OSError in one place
instead of ProcessExecutionError from nova.exception.  In a previous rev
of this code, it was using nova.utils.execute(), but no longer does.

Change-Id: I3dac2981b5c1a7cd5fc0e4e8dbf0a2d378a1d136

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