[Sheepdog] qemu-img convert slowness and high availability status

[krim son]

Ok I was able to reproduce, I believe this happens when booting a VM with a
sheepdog volume fails (because the sheep daemon was down). Here's the
output:

node 1:
# sheep -f /data/sheep/
sheep: jrnl_recover(2221) Openning the directory
/data/sheep//journal/00000009/.
sheep: set_addr(1595) addr = 172.16.1.1, port = 7000
sheep: main(144) Sheepdog daemon (version 0.2.3) started
sheep: get_cluster_status(403) sheepdog is waiting with older epoch, 10 9
172.16.1.2:7000

node 2:
# sheep -f /data/sheep/
sheep: jrnl_recover(2221) Openning the directory
/data/sheep//journal/00000010/.
sheep: set_addr(1595) addr = 172.16.1.2, port = 7000
sheep: main(144) Sheepdog daemon (version 0.2.3) started
sheep: send_join_request(1048) 33624236 22579
sheep: update_cluster_info(568) failed to join sheepdog, 65

# collie cluster info -a 172.16.1.1
Waiting for other nodes joining

Ctime                Epoch Nodes
2011-06-15 11:50:16      9 [172.16.1.1:7000, 172.16.1.2:7000]
# collie cluster info -a 172.16.1.2
The node had failed to join sheepdog

Ctime                Epoch Nodes
2011-06-15 11:50:16     10 [172.16.1.2:7000]
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