Don't modify injected_files inside PXE driver
Don't modify injected_files inside PXE driver

Make a local copy of injected_files so that we don't modify the
original.

Change-Id: I508cfc0baec15a091a1717eb2aebb9dd39278e5b

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