Set node_availability_zone in XenAPIAggregateTestCase
Set node_availability_zone in XenAPIAggregateTestCase

In XenAPIAggregateTestCase some service records
are directly injected to the db for testing with customized AZ
values . The AZ doesn't match the default availability
zone setting (nova), and may or may not be overwritten during
heart beat message update. It is mostly ignored but
sometimes make the test_remove_host_from_aggregate_error()
test fail, as discovered in the servicegroup test.
Set the AZ explicitly to get rid of the non-determinism.

Change-Id: I2ded5314480b2b7eb2254a58e3eb7ca9e3f8b32d

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