remove unused and buggy function from S3ImageService
remove unused and buggy function from S3ImageService

* nova/image/s3.py (S3ImageService.get): Remove

Change-Id: Ibe4526c821b9d05025956d49a6cb840d11ce013a

DirectXMan12/nova-hacking,savi-dev/nova,eharney/nova,paulmathews/nova,CloudServer/nova,tianweizhang/nova,usc-isi/extra-specs,houshengbo/nova_vmware_compute_driver,usc-isi/extra-specs,citrix-openstack-build/nova,thomasem/nova,rahulunair/nova,tanglei528/nova,mandeepdhami/nova,rajalokan/nova,plumgrid/plumgrid-nova,Yusuke1987/openstack_template,cloudbase/nova-virtualbox,thomasem/nova,apporc/nova,qwefi/nova,ewindisch/nova,cloudbase/nova-virtualbox,jeffrey4l/nova,takeshineshiro/nova,zaina/nova,mahak/nova,maoy/zknova,watonyweng/nova,kimjaejoong/nova,rickerc/nova_audit,shahar-stratoscale/nova,vladikr/nova_drafts,mahak/nova,russellb/nova,adelina-t/nova,angdraug/nova,DirectXMan12/nova-hacking,yatinkumbhare/openstack-nova,Francis-Liu/animated-broccoli,cloudbase/nova,ewindisch/nova,alvarolopez/nova,akash1808/nova_test_latest,rahulunair/nova,openstack/nova,OpenAcademy-OpenStack/nova-scheduler,CCI-MOC/nova,sebrandon1/nova,mmnelemane/nova,eharney/nova,vmturbo/nova,zaina/nova,usc-isi/extra-specs,Stavitsky/nova,JioCloud/nova,varunarya10/nova_test_latest,Juniper/nova,sacharya/nova,NeCTAR-RC/nova,tudorvio/nova,klmitch/nova,cernops/nova,tealover/nova,CEG-FYP-OpenStack/scheduler,alvarolopez/nova,luogangyi/bcec-nova,mikalstill/nova,shootstar/novatest,noironetworks/nova,qwefi/nova,ted-gould/nova,CiscoSystems/nova,klmitch/nova,fajoy/nova,dawnpower/nova,viggates/nova,mgagne/nova,luogangyi/bcec-nova,Triv90/Nova,devendermishrajio/nova,j-carpentier/nova,orbitfp7/nova,j-carpentier/nova,whitepages/nova,joker946/nova,MountainWei/nova,BeyondTheClouds/nova,eneabio/nova,akash1808/nova,ruslanloman/nova,NoBodyCam/TftpPxeBootBareMetal,varunarya10/nova_test_latest,sebrandon1/nova,sileht/deb-openstack-nova,sebrandon1/nova,maheshp/novatest,ntt-sic/nova,gspilio/nova,gspilio/nova,SUSE-Cloud/nova,MountainWei/nova,sileht/deb-openstack-nova,eonpatapon/nova,bclau/nova,JianyuWang/nova,maoy/zknova,savi-dev/nova,fajoy/nova,shail2810/nova,hanlind/nova,cernops/nova,projectcalico/calico-nova,affo/nova,imsplitbit/nova,akash1808/nova,fajoy/nova,mahak/nova,NewpTone/stacklab-nova,rickerc/nova_audit,aristanetworks/arista-ovs-nova,maelnor/nova,cyx1231st/nova,russellb/nova,NoBodyCam/TftpPxeBootBareMetal,paulmathews/nova,hanlind/nova,bigswitch/nova,saleemjaveds/https-github.com-openstack-nova,sridevikoushik31/nova,klmitch/nova,mikalstill/nova,TieWei/nova,gooddata/openstack-nova,yrobla/nova,nikesh-mahalka/nova,dawnpower/nova,akash1808/nova_test_latest,dstroppa/openstack-smartos-nova-grizzly,eneabio/nova,bigswitch/nova,NeCTAR-RC/nova,silenceli/nova,phenoxim/nova,TieWei/nova,spring-week-topos/nova-week,mandeepdhami/nova,ted-gould/nova,CCI-MOC/nova,cloudbau/nova,houshengbo/nova_vmware_compute_driver,CiscoSystems/nova,houshengbo/nova_vmware_compute_driver,maheshp/novatest,cyx1231st/nova,JioCloud/nova_test_latest,belmiromoreira/nova,yatinkumbhare/openstack-nova,double12gzh/nova,TwinkleChawla/nova,JioCloud/nova_test_latest,noironetworks/nova,Yusuke1987/openstack_template,LoHChina/nova,devendermishrajio/nova_test_latest,edulramirez/nova,JioCloud/nova,ruslanloman/nova,shail2810/nova,felixma/nova,Metaswitch/calico-nova,gooddata/openstack-nova,usc-isi/nova,whitepages/nova,petrutlucian94/nova_dev,rrader/nova-docker-plugin,zzicewind/nova,dstroppa/openstack-smartos-nova-grizzly,isyippee/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,iuliat/nova,ntt-sic/nova,NewpTone/stacklab-nova,eayunstack/nova,projectcalico/calico-nova,LoHChina/nova,blueboxgroup/nova,klmitch/nova,jianghuaw/nova,isyippee/nova,cloudbase/nova,russellb/nova,joker946/nova,vmturbo/nova,affo/nova,spring-week-topos/nova-week,scripnichenko/nova,alaski/nova,jianghuaw/nova,bclau/nova,rahulunair/nova,aristanetworks/arista-ovs-nova,hanlind/nova,Tehsmash/nova,eonpatapon/nova,sridevikoushik31/nova,alexandrucoman/vbox-nova-driver,leilihh/nova,vladikr/nova_drafts,sridevikoushik31/openstack,badock/nova,barnsnake351/nova,cloudbase/nova,rajalokan/nova,SUSE-Cloud/nova,felixma/nova,devendermishrajio/nova,rajalokan/nova,double12gzh/nova,jianghuaw/nova,shahar-stratoscale/nova,bgxavier/nova,gspilio/nova,petrutlucian94/nova_dev,nikesh-mahalka/nova,tangfeixiong/nova,petrutlucian94/nova,yosshy/nova,virtualopensystems/nova,iuliat/nova,badock/nova,cloudbau/nova,devendermishrajio/nova_test_latest,scripnichenko/nova,alaski/nova,josephsuh/extra-specs,leilihh/novaha,JianyuWang/nova,Yuriy-Leonov/nova,sridevikoushik31/nova,tanglei528/nova,rrader/nova-docker-plugin,Juniper/nova,tangfeixiong/nova,imsplitbit/nova,redhat-openstack/nova,devoid/nova,apporc/nova,aristanetworks/arista-ovs-nova,berrange/nova,jeffrey4l/nova,jianghuaw/nova,Metaswitch/calico-nova,leilihh/nova,Juniper/nova,josephsuh/extra-specs,BeyondTheClouds/nova,dims/nova,mikalstill/nova,viggates/nova,tealover/nova,rajalokan/nova,blueboxgroup/nova,fnordahl/nova,Yuriy-Leonov/nova,openstack/nova,petrutlucian94/nova,sridevikoushik31/openstack,gooddata/openstack-nova,Francis-Liu/animated-broccoli,psiwczak/openstack,orbitfp7/nova,vmturbo/nova,plumgrid/plumgrid-nova,Triv90/Nova,maheshp/novatest,psiwczak/openstack,yosshy/nova,Triv90/Nova,DirectXMan12/nova-hacking,mmnelemane/nova,tianweizhang/nova,mgagne/nova,belmiromoreira/nova,phenoxim/nova,Juniper/nova,silenceli/nova,CloudServer/nova,shootstar/novatest,watonyweng/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,NoBodyCam/TftpPxeBootBareMetal,TwinkleChawla/nova,zhimin711/nova,bgxavier/nova,sacharya/nova,maelnor/nova,saleemjaveds/https-github.com-openstack-nova,CEG-FYP-OpenStack/scheduler,berrange/nova,OpenAcademy-OpenStack/nova-scheduler,zhimin711/nova,redhat-openstack/nova,usc-isi/nova,citrix-openstack-build/nova,sridevikoushik31/openstack,eayunstack/nova,tudorvio/nova,raildo/nova,alexandrucoman/vbox-nova-driver,usc-isi/nova,virtualopensystems/nova,cernops/nova,Stavitsky/nova,adelina-t/nova,sileht/deb-openstack-nova,gooddata/openstack-nova,devoid/nova,openstack/nova,fnordahl/nova,BeyondTheClouds/nova,edulramirez/nova,eneabio/nova,vmturbo/nova,yrobla/nova,sridevikoushik31/nova,raildo/nova,psiwczak/openstack,savi-dev/nova,paulmathews/nova,barnsnake351/nova,dims/nova,takeshineshiro/nova,maoy/zknova,kimjaejoong/nova,NewpTone/stacklab-nova,zzicewind/nova,angdraug/nova,yrobla/nova,dstroppa/openstack-smartos-nova-grizzly,leilihh/novaha,Tehsmash/nova,josephsuh/extra-specs