core: Add flag to detect host kdump before fencing

Adds pmKdumpDetection flag to VdsStatic, to allow host kdump flow
detection before execution of fencing for host. This flag is part of
power management configuration.

Change-Id: Id72ea0e461d79df26873e93ef91ce9470a897a54
Bug-Url: https://bugzilla.redhat.com/1079821
Signed-off-by: Martin Perina <mperina@redhat.com>