ec2utils: Use VolumeMapping object
ec2utils: Use VolumeMapping object

Update ec2utils to use the VolumeMapping object instead of direct db
API calls for getting the ec2 ID to UUID mappings.

Change-Id: Id653fc16fffc1c416379087228a0b053b8868cac

cernops/nova,fnordahl/nova,tealover/nova,jianghuaw/nova,Francis-Liu/animated-broccoli,mahak/nova,projectcalico/calico-nova,joker946/nova,gooddata/openstack-nova,felixma/nova,klmitch/nova,nikesh-mahalka/nova,edulramirez/nova,varunarya10/nova_test_latest,Juniper/nova,saleemjaveds/https-github.com-openstack-nova,zhimin711/nova,scripnichenko/nova,j-carpentier/nova,CloudServer/nova,devendermishrajio/nova,CCI-MOC/nova,apporc/nova,mahak/nova,JioCloud/nova_test_latest,tangfeixiong/nova,blueboxgroup/nova,ruslanloman/nova,cernops/nova,bgxavier/nova,bigswitch/nova,mikalstill/nova,mikalstill/nova,eonpatapon/nova,joker946/nova,redhat-openstack/nova,mgagne/nova,silenceli/nova,hanlind/nova,alexandrucoman/vbox-nova-driver,cloudbase/nova,varunarya10/nova_test_latest,yatinkumbhare/openstack-nova,tianweizhang/nova,bgxavier/nova,Yusuke1987/openstack_template,noironetworks/nova,JianyuWang/nova,BeyondTheClouds/nova,berrange/nova,CEG-FYP-OpenStack/scheduler,double12gzh/nova,virtualopensystems/nova,dims/nova,hanlind/nova,phenoxim/nova,klmitch/nova,devendermishrajio/nova,cyx1231st/nova,alvarolopez/nova,whitepages/nova,vmturbo/nova,jeffrey4l/nova,Francis-Liu/animated-broccoli,vmturbo/nova,petrutlucian94/nova,JioCloud/nova,JianyuWang/nova,dawnpower/nova,Juniper/nova,maelnor/nova,alexandrucoman/vbox-nova-driver,eayunstack/nova,MountainWei/nova,mandeepdhami/nova,takeshineshiro/nova,klmitch/nova,CiscoSystems/nova,TwinkleChawla/nova,redhat-openstack/nova,sebrandon1/nova,gooddata/openstack-nova,fnordahl/nova,Juniper/nova,projectcalico/calico-nova,openstack/nova,akash1808/nova_test_latest,jianghuaw/nova,kimjaejoong/nova,thomasem/nova,iuliat/nova,berrange/nova,vmturbo/nova,belmiromoreira/nova,rahulunair/nova,mahak/nova,klmitch/nova,Yusuke1987/openstack_template,sebrandon1/nova,CiscoSystems/nova,maelnor/nova,raildo/nova,adelina-t/nova,shail2810/nova,mandeepdhami/nova,tianweizhang/nova,rajalokan/nova,watonyweng/nova,angdraug/nova,saleemjaveds/https-github.com-openstack-nova,takeshineshiro/nova,edulramirez/nova,tangfeixiong/nova,yosshy/nova,cloudbase/nova-virtualbox,kimjaejoong/nova,vladikr/nova_drafts,orbitfp7/nova,JioCloud/nova_test_latest,cloudbase/nova-virtualbox,rajalokan/nova,gooddata/openstack-nova,affo/nova,Metaswitch/calico-nova,thomasem/nova,Stavitsky/nova,raildo/nova,JioCloud/nova,openstack/nova,akash1808/nova_test_latest,iuliat/nova,akash1808/nova,jeffrey4l/nova,viggates/nova,zaina/nova,tanglei528/nova,ruslanloman/nova,rajalokan/nova,ted-gould/nova,petrutlucian94/nova,jianghuaw/nova,LoHChina/nova,tealover/nova,devendermishrajio/nova_test_latest,tanglei528/nova,scripnichenko/nova,mikalstill/nova,vmturbo/nova,angdraug/nova,dims/nova,felixma/nova,virtualopensystems/nova,Tehsmash/nova,ted-gould/nova,akash1808/nova,j-carpentier/nova,mmnelemane/nova,devendermishrajio/nova_test_latest,Juniper/nova,BeyondTheClouds/nova,belmiromoreira/nova,alaski/nova,watonyweng/nova,nikesh-mahalka/nova,Stavitsky/nova,badock/nova,barnsnake351/nova,zhimin711/nova,shail2810/nova,Tehsmash/nova,tudorvio/nova,double12gzh/nova,cernops/nova,yatinkumbhare/openstack-nova,Metaswitch/calico-nova,eonpatapon/nova,affo/nova,zzicewind/nova,zzicewind/nova,cloudbase/nova,apporc/nova,CEG-FYP-OpenStack/scheduler,zaina/nova,alvarolopez/nova,noironetworks/nova,CCI-MOC/nova,TwinkleChawla/nova,adelina-t/nova,hanlind/nova,eayunstack/nova,jianghuaw/nova,gooddata/openstack-nova,vladikr/nova_drafts,silenceli/nova,blueboxgroup/nova,openstack/nova,orbitfp7/nova,rajalokan/nova,isyippee/nova,sebrandon1/nova,rahulunair/nova,bigswitch/nova,NeCTAR-RC/nova,tudorvio/nova,mgagne/nova,NeCTAR-RC/nova,whitepages/nova,yosshy/nova,viggates/nova,LoHChina/nova,isyippee/nova,BeyondTheClouds/nova,phenoxim/nova,rahulunair/nova,cyx1231st/nova,barnsnake351/nova,badock/nova,CloudServer/nova,cloudbase/nova,mmnelemane/nova,alaski/nova,dawnpower/nova,MountainWei/nova