vdsm_reg: remove engine.py.in

engine.py.in was stored in vdsm_reg as part of ovirt-node
TUI registration stuff. Currently we have ovirt-node-plugin-vdsm
project which contain engine_page.py replacing this old file.

Change-Id: I255b7e4c1c336ceed3b9082ba6228fbc5a5795f8
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/26411
Reviewed-by: Fabian Deutsch <fabiand@fedoraproject.org>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>