[Pacemaker] New fix for System Health

[Mark Hamzy]

I caught a bug in the code (first diff in the patch).

I added some testcases.  At least I hoped that I added them in the appriate
way.  I noticed that the source tarball in the source rpm does not include
either pengine/test6 or pengine/test10.

And I took an intial stab at the documentation:
http://www.clusterlabs.org/wiki/SystemHealth

(See attached file: pacemaker.mark.patch)

Mark
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