Remove dmidecode build requirement

Change-Id: I9bd562b02135a66134f152f566f74e4ba6f5eaa8
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30682
Reviewed-by: Dan Kenigsberg <danken@redhat.com>