Don't log warn if v3 API is disabled.
Don't log warn if v3 API is disabled.

This makes sense because the V3 API is disabled by default.

Fixes LP Bug #1187217.

Change-Id: I1f182fa480bfef19dbe6d4b575200100fe2ee515

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