Remove unused nova.common module
Remove unused nova.common module

It seems like the common is unused. I an wondering what jenkins will say.

Change-Id: I55366dc30e46b09d19124dbe821a115999bf7395

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