VMware: remove local variable
VMware: remove local variable

Make use of the instance.root_gb instead of reading the value
into a local variable.

TrivialFix

Change-Id: I2ae4a9d2f5383ff05f47d00550c1c917fedc5db9

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