Add lib/tool/restore_nets.py to debian/vdsm-python-install

Change-Id: I33359a99aede12eeb29c47906434e8be79db63de
Signed-off-by: Assaf Muller <amuller@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21044
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>