Fixes a bug in api.metadata.base.lookup() on Windows
Fixes a bug in api.metadata.base.lookup() on Windows

Fixes Bug #1077125

api.metadata.base.lookup() uses os.path.normpath() to normalize urls.
This doesn't work on Windows as it transforms "/" in "\".

The fix solves the issue, but os.path.normpath() should never be used
to normalize urls.

Change-Id: I83d0795d5875acac5fe9bd543f9ca9b4a3e2c8d5

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