ec2: Change FormatMappingTestCase to NoDBTestCase
ec2: Change FormatMappingTestCase to NoDBTestCase

The test doesn't hit the database at all so make it
a NoDBTestCase.

As far as I can tell this is the last ec2 API unit test
class that isn't a trivial convert to NoDBTestCase, all
the rest require some mocking of the objects or DB API
layers to convert them to NoDBTestCase, which I plan to
work on in later patches.

Change-Id: I682a377d769312e8f37f874aa4548665b3b52ed3

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