Fetch kernel/ramdisk images directly
Fetch kernel/ramdisk images directly

Kernel and ramdisk images don't have a VDI allocated to them, so printing
the UUID in _fetch_image will show None.

[...] Fetched VDIs of type 'ramdisk' with UUID  'None' [...]

Change-Id: I1113606a97b48518e1db61f737633140b0f5eccd

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