Templatize extension handling.
Templatize extension handling.

Related to bug 852141: Converts extensions.py to using XML templates
instead of the classic XML serializer.

Change-Id: I41c9db8eb984f06222e7b42d5040afdf1e1101e8

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