Use right oslo.service entry points
Use right oslo.service entry points

Use oslo.service.sslutils and periodic_task entry points to generate
a sample configuration file. oslo.service library doesn't have
an oslo.service entry point.

Change-Id: I240afb39c043fdeb39c7807bdf086927186ab881
Closes-Bug: 1468955

ekasitk/sahara,zhangjunli177/sahara,zhangjunli177/sahara,egafford/sahara,crobby/sahara,ekasitk/sahara,crobby/sahara,zhangjunli177/sahara,ekasitk/sahara,egafford/sahara,tellesnobrega/sahara,openstack/sahara,crobby/sahara,tellesnobrega/sahara,openstack/sahara