Require netaddr>=0.7.6 to avoid UnboundLocalError
Require netaddr>=0.7.6 to avoid UnboundLocalError

This issue is discussed at https://github.com/drkjam/netaddr/issues/2.
The bug in netaddr was fixed in release 0.7.6 on 13th Sep 2011.

Change-Id: Iea75a30963a09f9b0dd94138460bf041ab98fc66
Fixes: bug #1157058

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