Address Soren's comments:  * clean up temp files if an ImageUnacceptable is going to be raised    Note, a qemu-img execution error will not clean up the image, but I    think thats reasonable.  We leave the image on disk so the user can    easily investigate.  * Change final 2 arguments to fetch_to_raw to not start with an _  * use 'env' utility to change environment variables LC_ALL and LANG so    that qemu-img output parsing is not locale dependent.    Note, I considered the following, but found using 'env' more readable      out, err = utils.execute('sh', '-c', 'export LC_ALL=C LANG=C && exec "$@"',          'qemu-img', 'info', path)
Address Soren's comments:
 * clean up temp files if an ImageUnacceptable is going to be raised
   Note, a qemu-img execution error will not clean up the image, but I
   think thats reasonable.  We leave the image on disk so the user can
   easily investigate.
 * Change final 2 arguments to fetch_to_raw to not start with an _
 * use 'env' utility to change environment variables LC_ALL and LANG so
   that qemu-img output parsing is not locale dependent.
   Note, I considered the following, but found using 'env' more readable
     out, err = utils.execute('sh', '-c', 'export LC_ALL=C LANG=C && exec "$@"',
         'qemu-img', 'info', path)

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