boto shouldn't be required for production deploys
boto shouldn't be required for production deploys

... if you're not using ec2/s3.

Fixes bug 949631

bin/nova-manage imports auth.manager which imports auth.signer which
tries to import boto...  but nova-manage doesn't try to authenticate.

This patch allows bin/nova-manage to work if you don't have boto
installed.

Change-Id: I9b7929a15b991498ab0491821521ec20ed0da65c

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