Move database_connection sample config to the correct section
Move database_connection sample config to the correct section

Change-Id: I0c9cc52d040a4b1ed0a47a72e518f06d70ad37be

openstack/designate,melodous/designate,NeCTAR-RC/designate,ramsateesh/designate,richm/designate,richm/designate,tonyli71/designate,grahamhayes/designate,cneill/designate-testing,cneill/designate-testing,muraliselva10/designate,kiall/designate-py3,cneill/designate,kiall/designate-py3,ramsateesh/designate,melodous/designate,ramsateesh/designate,ionrock/designate,kiall/designate-py3,ionrock/designate,muraliselva10/designate,kiall/designate-py3,ionrock/designate,grahamhayes/designate,grahamhayes/designate,cneill/designate,melodous/designate,tonyli71/designate,melodous/designate,cneill/designate,tonyli71/designate,openstack/designate,kiall/designate-py3,NeCTAR-RC/designate,cneill/designate,muraliselva10/designate,cneill/designate-testing,cneill/designate,openstack/designate