hooks: Renamed openstacknet_consts file

In order to put functions in the shared file, it is more appropriate to
name it openstacknet_utils rather than openstacknet_consts.

Change-Id: I5cf8c6ce2463e89e88b761f25801a2dcfc8a083c
Signed-off-by: Mike Kolesnik <mkolesni@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/22582
Reviewed-by: Dan Kenigsberg <danken@redhat.com>