removed unused method _get_default_deleted_value
removed unused method _get_default_deleted_value

Since Idff93ab4fa3397746999a836de54354235919471
this method became unused

Change-Id: I6ad313324e3dfee637972fb9a0c8cfc29566ff9a

fnordahl/nova,jianghuaw/nova,bigswitch/nova,rahulunair/nova,BeyondTheClouds/nova,Francis-Liu/animated-broccoli,whitepages/nova,openstack/nova,sebrandon1/nova,vmturbo/nova,rahulunair/nova,edulramirez/nova,eonpatapon/nova,zzicewind/nova,devendermishrajio/nova_test_latest,j-carpentier/nova,BeyondTheClouds/nova,felixma/nova,jeffrey4l/nova,cernops/nova,cloudbase/nova,edulramirez/nova,phenoxim/nova,CCI-MOC/nova,akash1808/nova_test_latest,ruslanloman/nova,isyippee/nova,LoHChina/nova,mmnelemane/nova,hanlind/nova,cernops/nova,CCI-MOC/nova,shail2810/nova,nikesh-mahalka/nova,MountainWei/nova,cernops/nova,zhimin711/nova,Juniper/nova,rajalokan/nova,JianyuWang/nova,zaina/nova,zhimin711/nova,apporc/nova,takeshineshiro/nova,TwinkleChawla/nova,openstack/nova,varunarya10/nova_test_latest,dims/nova,j-carpentier/nova,jeffrey4l/nova,bigswitch/nova,CEG-FYP-OpenStack/scheduler,klmitch/nova,alaski/nova,cloudbase/nova,mahak/nova,CEG-FYP-OpenStack/scheduler,noironetworks/nova,ted-gould/nova,felixma/nova,hanlind/nova,klmitch/nova,fnordahl/nova,zzicewind/nova,varunarya10/nova_test_latest,mikalstill/nova,gooddata/openstack-nova,zaina/nova,mahak/nova,Juniper/nova,openstack/nova,mahak/nova,gooddata/openstack-nova,gooddata/openstack-nova,scripnichenko/nova,MountainWei/nova,BeyondTheClouds/nova,yosshy/nova,klmitch/nova,klmitch/nova,mikalstill/nova,shail2810/nova,dims/nova,takeshineshiro/nova,yosshy/nova,NeCTAR-RC/nova,isyippee/nova,NeCTAR-RC/nova,raildo/nova,TwinkleChawla/nova,rajalokan/nova,vmturbo/nova,noironetworks/nova,Francis-Liu/animated-broccoli,iuliat/nova,hanlind/nova,gooddata/openstack-nova,raildo/nova,phenoxim/nova,ruslanloman/nova,vmturbo/nova,devendermishrajio/nova,eonpatapon/nova,mikalstill/nova,cloudbase/nova,whitepages/nova,JioCloud/nova_test_latest,sebrandon1/nova,mmnelemane/nova,JioCloud/nova_test_latest,Juniper/nova,jianghuaw/nova,barnsnake351/nova,ted-gould/nova,rajalokan/nova,akash1808/nova_test_latest,nikesh-mahalka/nova,cyx1231st/nova,watonyweng/nova,apporc/nova,Juniper/nova,LoHChina/nova,rahulunair/nova,jianghuaw/nova,iuliat/nova,scripnichenko/nova,alaski/nova,jianghuaw/nova,sebrandon1/nova,devendermishrajio/nova,vmturbo/nova,JianyuWang/nova,rajalokan/nova,cyx1231st/nova,barnsnake351/nova,devendermishrajio/nova_test_latest,watonyweng/nova