Mid: fenced: Fencing escalation may not be performed if there is no topology.

[HideoYamauchi]

Hi All,

I was very late. This fix is a modified version of the following WIP PR.

• https://github.com/ClusterLabs/pacemaker/pull/2401

In response to previous comments, we have changed the process significantly. The original problem is that the fencing escalation of the DC node fails in the absence of topology.

• Broadcast failure to notify you of fencing failures.
• Nodes other than the DC node that received this fencing failure will track subsequent escalation fencing with a timer to prevent it from floating in pending.
• The failure time will always skip the set in finalize_op to save the time of failure.

What I thought about writing this fix was that, as I received a comment before, it may be better to relay to another node and fencing even if there is no topology.

Best Regards, Hideo Yamauchi.