Changes to 'fence_sanlock'

[David Teigland]

New branch 'fence_sanlock' available with the following commits:
commit 51b228a549e15b098b598786a9bfd3d7cfb7fd99
Author: David Teigland 
Date:   Fri Sep 14 10:31:37 2012 -0500

fence_sanlock: new code

A fence agent that uses /dev/watchdog to reset hosts.
    Per-host sanlock leases on shared storage are used:
    - for hosts to detect that they are being fenced by
      someone if they haven't actually failed
    - for hosts to verify that fenced hosts have been
      reset by seeing their host_id leases expire (not
      be renewed on disk)
    - for hosts to know how long to wait after fencing
      before they can proceed, based on acquiring the
      expired lease of the fenced host

Signed-off-by: David Teigland