Add test to check extension timestamps
Add test to check extension timestamps

* Prevents bug 975287 from cropping up in the future

Change-Id: Ief04c285cb2356db5ea6695c55416cee76512842

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