Fix error string
stonith: Ease deployment with SBD

While we cannot fully deploy SBD fencing (the user needs to provide the
devices and to make sure there's a watchdog for this hardware), we can
help a bit by doing the last few bits.
sbd: Claim disks that we're going to use for SBD
Add SBD per node table
Allow specifying attribute name for per node table
Generalize stonith table for other data types

Allow other data types (arrays, comma separated values) to be displayed
in the stonith table.
Split on commas and spaces in SBD table
sbd: Pass -P to sbd

This option is used to "Check Pacemaker quorum and node health" and is
recommended by our HA experts.
Merge pull request #71 from vuntz/sbd

Add option for SBD