Convert gate_hook to devstack-tools
Convert gate_hook to devstack-tools

Change-Id: I2387bc9778a77b1673751bc4c1ff50f8d4826a5d
Co-Authored-By: Ihar Hrachyshka <b339079bdd0c511d3934e046f7b02c5281dc2db1@redhat.com>
Co-Authored-By: Sean Dague <d7e19930cc1f42c2d0781f4d9e6f1fe5891bf9cf@dague.net>
Original-Commit: Ibd0f67f9131e7f67f3a4a62cb6ad28bf80e11bbf

openstack/python-neutronclient,noironetworks/python-neutronclient,noironetworks/python-neutronclient,huntxu/python-neutronclient,openstack/python-neutronclient,huntxu/python-neutronclient