Changed error message to match usage
Changed error message to match usage

InstanceDiskTypeTooSmall is not the proper error message, it should be
FlavorDiskTooSmall.

Change-Id: Id928015534161cba296c17114ef2d19d96e8781d

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