Change used configured range for display port to 5900-6923

this changes the AIO configuration and the database vdc_options for
iptables rules.

This patch goes together with http://gerrit.ovirt.org/#/c/17058

Change-Id: I1b93517965437b74b88e092d666fe2e91c43a6d3
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=983088
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>