Log cleanups for nova.virt.libvirt.volume
Log cleanups for nova.virt.libvirt.volume

More log cleanups:
 - add log hints for error and warning levels

Change-Id: Idff1575208a1004350d89848059541502ee15e9a

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