Correct inheritance of nova.volume.cinder.API
Correct inheritance of nova.volume.cinder.API

nova.volume.cinder.API was deriving incorrectly from nova.db.base. This
patch simply removes that unnecessary import and changes
nova.volume.cinder.API to derive from object instead.

Change-Id: I5092b7fbb3780317a09a512aed7ecbe1d57a4428
Closes-bug: #1292997

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