Drop sslutils and versionutils modules
Drop sslutils and versionutils modules

The modules are not used since when we've switched to oslo.messaging.

Change-Id: Ife4298e0bb29ec15404fafe4b48545bd65e038e3

gaolichuang/neutron-fwaas,gaolichuang/neutron-fwaas,openstack/neutron-fwaas,dougwig/x-neutron-fwaas,openstack/neutron-fwaas,citrix-openstack-build/neutron-fwaas