Remove orphaned db method instance_test_and_set
Remove orphaned db method instance_test_and_set

Commit 86544fad81f95b74407a76bea8b081f490e2832f removed the only use
of this method together with the sqlalchemy implementation of it but
forgot to remove it from db.api.

Change-Id: I751f99ee64cdeab56f1f3fd9f846157f241804a2

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