ledger object leak

[sirio81]

Summary: creating and removing snapshot leave ledger objects.

Ho to reproduce:
create and remove snaphosts.
Here's a script to do it quickly

---
#!/bin/bash

obj_dir=/mnt/sheep/0
dog vdi create -P test 1G

for n in $(seq 1 10)
do
  lg=$(find $obj_dir -name "8*" | wc -l)
  echo "ledger objects: $lg"
  echo "taking snapshot $n"
  dog vdi snapshot -s stress test
  lg=$(find $obj_dir -name "8*" | wc -l)
  echo "ledger objects: $lg"
  echo "removing snapshot $n"
  dog vdi delete -s stress test
  lg=$(find $obj_dir -name "8*" | wc -l)
done
echo "ledger objects: $lg"
---

1 vdi, 10 snapshot taken and removed, 8 ledger objects left:

ledger objects: 1
taking snapshot 1
ledger objects: 1
removing snapshot 1
ledger objects: 1
taking snapshot 2
ledger objects: 2
removing snapshot 2
ledger objects: 2
taking snapshot 3
ledger objects: 2
removing snapshot 3
ledger objects: 2
taking snapshot 4
ledger objects: 3
removing snapshot 4
ledger objects: 3
taking snapshot 5
ledger objects: 4
removing snapshot 5
ledger objects: 4
taking snapshot 6
ledger objects: 5
removing snapshot 6
ledger objects: 5
taking snapshot 7
ledger objects: 6
removing snapshot 7
ledger objects: 6
taking snapshot 8
ledger objects: 6
removing snapshot 8
ledger objects: 6
taking snapshot 9
ledger objects: 7
removing snapshot 9
ledger objects: 7
taking snapshot 10
ledger objects: 8
removing snapshot 10
ledger objects: 8

ls -lh /mnt/sheep/0/8*
-rw-r----- 1 root root 13M ott 23 23:46 /mnt/sheep/0/807c2b2500000000
-rw-r----- 1 root root 13M ott 23 23:46 /mnt/sheep/0/807c2b2700000000
-rw-r----- 1 root root 13M ott 23 23:46 /mnt/sheep/0/807c2b2900000000
-rw-r----- 1 root root 13M ott 23 23:46 /mnt/sheep/0/807c2b2a00000000
-rw-r----- 1 root root 13M ott 23 23:47 /mnt/sheep/0/807c2b2b00000000
-rw-r----- 1 root root 13M ott 23 23:47 /mnt/sheep/0/807c2b2c00000000
-rw-r----- 1 root root 13M ott 23 23:47 /mnt/sheep/0/807c2b2e00000000
-rw-r----- 1 root root 13M ott 23 23:47 /mnt/sheep/0/807c2b2f00000000