kdump: Fix kexec-tools dependency for RHEL 7

Fixes kexec-tools package dependency for RHEL 7. kexec-tools 2.0.4-32
is part of RHEL 7.0, but it doesn't contain support for fence_kdump
config. kexec-tools 2.0.4-33, which contains support for fence_kdump
config, will be part of RHEL 7.1.

Change-Id: Id898ba2ef1f4ab38253892e78e83443e8bf36eac
Bug-Url: https://bugzilla.redhat.com/1079821
Signed-off-by: Martin Perina <mperina@redhat.com>