[Pacemaker] Mail notification for fencing action

[Devin Reade]

It may be a bit late given that you've just created your own script,
but you can grab the check-cluster (and maybe check-drbd) scripts from
the gno-cluster-tools package at <ftp://ftp.gno.org/pub/tools/cluster-tools>

If I have a cluster that is not otherwise monitored, I run those
every three hours or so.  It'll spam you with email, from (at least)
the live node, but it's better than nothing.

Devin