Description of problem:
Deleting a fence device which is in use, causes a traceback on Nodes page
Steps to Reproduce:
1. Create a fence device
2. Add a fence instance to a node
3. Delete that fence device
4. Try to view that node
The fence instance should be removed with the fence device
fence devices in use can be deleted cleanly without errors when viewing the node details.
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.