node with fence_scsi fails to start cman with 'unfence failed' error messages in RHEL 6 when not using clvmd or the fence_scsi devices attribute

Issue

• The node configured with scsi fencing is unable to join cluster and shows unfence failed error messages:

  Apr 23 15:58:29 node1 corosync[2326]:   [TOTEM ] A processor joined or left the membership and a new membership was formed.
  Apr 23 15:58:29 node1 corosync[2326]:   [QUORUM] Members[2]: 1 2
  Apr 23 15:58:29 node1 corosync[2326]:   [QUORUM] Members[2]: 1 2
  Apr 23 15:58:29 node1 corosync[2326]:   [CPG   ] chosen downlist: sender r(0) ip(10.65.211.76) ; members(old:1 left:0)
  Apr 23 15:58:29 node1 corosync[2326]:   [MAIN  ] Completed service synchronization, ready to provide service.
  Apr 23 15:58:29 node1 dlm_controld[2412]: dlm_controld 3.0.12.1 started
  Apr 23 15:58:29 node1 gfs_controld[2459]: gfs_controld 3.0.12.1 started
  Apr 23 15:58:30 node1 fence_node[2502]: unfence node1 failed            <----------
  Apr 23 15:58:30 node1 kernel: dlm: closing connection to node 2
  Apr 23 15:58:30 node1 kernel: dlm: closing connection to node 1
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Unloading all Corosync service engines.
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync extended virtual synchrony service
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync configuration service
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync cluster closed process group service v1.01
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync cluster config database access v1.01
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync profile loading service
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: openais checkpoint service B.01.01
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync CMAN membership service 2.90
  Apr 23 15:58:31 node1 corosync[2326]:   [SERV  ] Service engine unloaded: corosync cluster quorum service v0.1
  Apr 23 15:58:31 node1 corosync[2326]:   [MAIN  ] Corosync Cluster Engine exiting with status 0 at main.c:1894.