disk/vfs: make docstring conventional to python
disk/vfs: make docstring conventional to python

Updates docstring to make it conventional to Python

Change-Id: I5a9383be77a639a3cc25f727f59cddfd22889d70

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