Description of problem:

Currently in Virtualization -> Overview -> Filesystem usage has a metric about pod filesystem usage, which should be dropped by BZ2072793.

Please replace it with actual VM filesystem usage collected by guest agent:

1. oc rsh virt-launcher-rhel8-accepted-panda-m2ghb
   sh-4.4# virsh qemu-agent-command 1 ' {"execute":"guest-get-fsinfo"}

   ' --pretty
   {
   "return": [
   {
   "name": "vda2",
   "total-bytes": 104634368,
   "mountpoint": "/boot/efi",
   "disk": [

   Unknown macro: { "bus-type"}

   ],
   "used-bytes": 6006784,
   "type": "vfat"
   },
   {
   "name": "vda3",
   "total-bytes": 11244908544,
   "mountpoint": "/",
   "disk": [

   Unknown macro: { "bus-type"}

   ],
   "used-bytes": 4077879296,
   "type": "xfs"
   }
   ]
   }