Fix ReservationTestCase on PostgreSQL
Fix ReservationTestCase on PostgreSQL

setUp() of ReservationTestCase calls quota_reserve() passing
timeutils.utcnow() as a value of 'until_refresh' argument.
until_refresh column is actually of type int rather than
datetime or varchar, so these tests fail on PostgreSQL.

Blueprint: db-api-tests-on-all-backends

Change-Id: Ib57579db2080f44bd41b91e83b0eee6f77f51840

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