Correct DynECT backend config option types
Correct DynECT backend config option types

Change-Id: If3a00544ad7932ed100dd7a33b4dec9510addb19

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