libvirt: convert GlusterFS driver to LibvirtBaseFileSystemVolumeDriver
libvirt: convert GlusterFS driver to LibvirtBaseFileSystemVolumeDriver

Part of blueprint consolidate-libvirt-fs-volume-drivers

Change-Id: Id6ddeaa998cea7e92bd03925f39211a5d086bd47

zzicewind/nova,gooddata/openstack-nova,bigswitch/nova,MountainWei/nova,rajalokan/nova,dims/nova,cyx1231st/nova,NeCTAR-RC/nova,rajalokan/nova,CEG-FYP-OpenStack/scheduler,cloudbase/nova,Francis-Liu/animated-broccoli,ted-gould/nova,klmitch/nova,LoHChina/nova,sebrandon1/nova,gooddata/openstack-nova,alaski/nova,scripnichenko/nova,Francis-Liu/animated-broccoli,vmturbo/nova,klmitch/nova,mmnelemane/nova,mmnelemane/nova,zhimin711/nova,CCI-MOC/nova,bigswitch/nova,whitepages/nova,BeyondTheClouds/nova,JianyuWang/nova,klmitch/nova,mahak/nova,CEG-FYP-OpenStack/scheduler,JianyuWang/nova,nikesh-mahalka/nova,noironetworks/nova,TwinkleChawla/nova,alaski/nova,shail2810/nova,watonyweng/nova,vmturbo/nova,BeyondTheClouds/nova,noironetworks/nova,gooddata/openstack-nova,phenoxim/nova,jianghuaw/nova,mahak/nova,zhimin711/nova,klmitch/nova,scripnichenko/nova,cernops/nova,barnsnake351/nova,mikalstill/nova,gooddata/openstack-nova,cloudbase/nova,openstack/nova,takeshineshiro/nova,rahulunair/nova,yosshy/nova,ted-gould/nova,j-carpentier/nova,rajalokan/nova,j-carpentier/nova,takeshineshiro/nova,edulramirez/nova,vmturbo/nova,mikalstill/nova,whitepages/nova,phenoxim/nova,mahak/nova,MountainWei/nova,yosshy/nova,edulramirez/nova,watonyweng/nova,sebrandon1/nova,cernops/nova,apporc/nova,felixma/nova,mikalstill/nova,dims/nova,LoHChina/nova,nikesh-mahalka/nova,isyippee/nova,cernops/nova,Juniper/nova,hanlind/nova,rahulunair/nova,CCI-MOC/nova,jianghuaw/nova,apporc/nova,raildo/nova,raildo/nova,zzicewind/nova,openstack/nova,shail2810/nova,NeCTAR-RC/nova,cyx1231st/nova,devendermishrajio/nova,TwinkleChawla/nova,Juniper/nova,jianghuaw/nova,rahulunair/nova,fnordahl/nova,cloudbase/nova,fnordahl/nova,Juniper/nova,felixma/nova,jianghuaw/nova,hanlind/nova,hanlind/nova,barnsnake351/nova,BeyondTheClouds/nova,sebrandon1/nova,isyippee/nova,vmturbo/nova,Juniper/nova,rajalokan/nova,devendermishrajio/nova,openstack/nova