Update devref setup docs for latest libvirt on ubuntu
Update devref setup docs for latest libvirt on ubuntu

Adds instructions on how to enable the ubuntu cloud-archive
and update to the latest libvirt-dev from the icehouse repo.

This is needed to run unit tests in Juno if you're still on
ubuntu precise.

Change-Id: I8c93afdd72256b2bdc487e1413bdd570a6ea59e8

thomasem/nova,mahak/nova,LoHChina/nova,tangfeixiong/nova,vmturbo/nova,jeffrey4l/nova,edulramirez/nova,jianghuaw/nova,JioCloud/nova,virtualopensystems/nova,cernops/nova,nikesh-mahalka/nova,CEG-FYP-OpenStack/scheduler,jianghuaw/nova,viggates/nova,JianyuWang/nova,yatinkumbhare/openstack-nova,petrutlucian94/nova,gooddata/openstack-nova,rahulunair/nova,Francis-Liu/animated-broccoli,j-carpentier/nova,BeyondTheClouds/nova,mandeepdhami/nova,mahak/nova,alexandrucoman/vbox-nova-driver,TwinkleChawla/nova,NeCTAR-RC/nova,LoHChina/nova,rajalokan/nova,klmitch/nova,cyx1231st/nova,CEG-FYP-OpenStack/scheduler,isyippee/nova,yosshy/nova,Metaswitch/calico-nova,Juniper/nova,silenceli/nova,alvarolopez/nova,badock/nova,Stavitsky/nova,mgagne/nova,klmitch/nova,rahulunair/nova,zhimin711/nova,adelina-t/nova,saleemjaveds/https-github.com-openstack-nova,projectcalico/calico-nova,cloudbase/nova-virtualbox,sebrandon1/nova,openstack/nova,mgagne/nova,belmiromoreira/nova,redhat-openstack/nova,devendermishrajio/nova_test_latest,gooddata/openstack-nova,angdraug/nova,tianweizhang/nova,Metaswitch/calico-nova,alaski/nova,yosshy/nova,mandeepdhami/nova,scripnichenko/nova,watonyweng/nova,TwinkleChawla/nova,cyx1231st/nova,vmturbo/nova,cloudbase/nova,thomasem/nova,berrange/nova,CloudServer/nova,takeshineshiro/nova,whitepages/nova,adelina-t/nova,blueboxgroup/nova,affo/nova,bigswitch/nova,maelnor/nova,scripnichenko/nova,CCI-MOC/nova,sebrandon1/nova,cernops/nova,isyippee/nova,virtualopensystems/nova,redhat-openstack/nova,kimjaejoong/nova,Tehsmash/nova,devendermishrajio/nova,devendermishrajio/nova_test_latest,gooddata/openstack-nova,jianghuaw/nova,eonpatapon/nova,Juniper/nova,JioCloud/nova_test_latest,shail2810/nova,tianweizhang/nova,zaina/nova,zaina/nova,dims/nova,zzicewind/nova,joker946/nova,zzicewind/nova,cloudbase/nova,rajalokan/nova,rahulunair/nova,eonpatapon/nova,vmturbo/nova,ruslanloman/nova,tealover/nova,iuliat/nova,saleemjaveds/https-github.com-openstack-nova,badock/nova,dims/nova,jeffrey4l/nova,tangfeixiong/nova,maelnor/nova,jianghuaw/nova,tudorvio/nova,felixma/nova,klmitch/nova,affo/nova,Yusuke1987/openstack_template,mikalstill/nova,nikesh-mahalka/nova,mikalstill/nova,openstack/nova,hanlind/nova,phenoxim/nova,raildo/nova,rajalokan/nova,zhimin711/nova,eayunstack/nova,mahak/nova,viggates/nova,ted-gould/nova,noironetworks/nova,tealover/nova,projectcalico/calico-nova,devendermishrajio/nova,vladikr/nova_drafts,NeCTAR-RC/nova,vmturbo/nova,akash1808/nova_test_latest,Francis-Liu/animated-broccoli,cernops/nova,hanlind/nova,yatinkumbhare/openstack-nova,mikalstill/nova,watonyweng/nova,barnsnake351/nova,BeyondTheClouds/nova,j-carpentier/nova,hanlind/nova,akash1808/nova,bgxavier/nova,blueboxgroup/nova,noironetworks/nova,whitepages/nova,cloudbase/nova-virtualbox,double12gzh/nova,sebrandon1/nova,barnsnake351/nova,CCI-MOC/nova,fnordahl/nova,Tehsmash/nova,cloudbase/nova,alaski/nova,apporc/nova,MountainWei/nova,Juniper/nova,JioCloud/nova,akash1808/nova,eayunstack/nova,felixma/nova,Stavitsky/nova,MountainWei/nova,JioCloud/nova_test_latest,alvarolopez/nova,CloudServer/nova,gooddata/openstack-nova,dawnpower/nova,openstack/nova,bgxavier/nova,shail2810/nova,petrutlucian94/nova,BeyondTheClouds/nova,bigswitch/nova,mmnelemane/nova,mmnelemane/nova,varunarya10/nova_test_latest,raildo/nova,orbitfp7/nova,vladikr/nova_drafts,rajalokan/nova,joker946/nova,belmiromoreira/nova,angdraug/nova,berrange/nova,phenoxim/nova,JianyuWang/nova,orbitfp7/nova,tudorvio/nova,apporc/nova,Juniper/nova,double12gzh/nova,ruslanloman/nova,silenceli/nova,takeshineshiro/nova,fnordahl/nova,Yusuke1987/openstack_template,ted-gould/nova,alexandrucoman/vbox-nova-driver,akash1808/nova_test_latest,edulramirez/nova,klmitch/nova,kimjaejoong/nova,varunarya10/nova_test_latest,dawnpower/nova,iuliat/nova