A fence_kdump stonith device fails to start and fencing fails in RHEL 6 or 7 pacemaker clusters

Issue

• How can I use fence_kdump with pacemaker on RHEL 6?
• I have created a stonith device using fence_kdump, but pcs shows it as Stopped and shows a failure in trying to start it:

# pcs status 
[...]
Online: [ rhel6-node1-pcmk.example.com rhel6-node2-pcmk.example.com ]

Full list of resources:

 fs (ocf::heartbeat:Filesystem):    Started rhel6-node2-pcmk.example.com 
 kdump  (stonith:fence_kdump):  Stopped 

Failed actions:
    kdump_start_0 on rhel6-node1-pcmk.example.com 'unknown error' (1): call=31, status=Error, last-rc-change='Mon May  5 16:46:30 2014', queued=1011ms, exec=0ms

• My fence_kdump stonith device is reporting errors in /var/log/messages:

May  5 16:46:31 rhel6-node1-pcmk stonith-ng[2136]:   notice: log_operation: Operation 'monitor' [2278] for device 'kdump' returned: -201 (Generic Pacemaker error)
May  5 16:46:31 rhel6-node1-pcmk stonith-ng[2136]:  warning: log_operation: kdump:2278 [ [error]: unsupported action 'monitor' ]