Make instance_system_metadata load with instance
Make instance_system_metadata load with instance

Right now, instance['system_metadata'] is demand-loaded at the
first use. This adds the necessary db fu to make it load at
instance_get_*() time.

Change-Id: Id29342fd34fe710b797b23558ef0fde8809231bc

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