only configure ports and bridges with bridge mappings
only configure ports and bridges with bridge mappings

this commits adds code so that ports and bridges are
only configured when bridge mappings are specified.

openstack/puppet-neutron,aldavud/puppet-neutron,enovance/openstack-quantum-puppet,fuel-infra/puppet-neutron,openstack/puppet-neutron,CiscoSystems/puppet-neutron,hkumarmk/puppet-neutron,varunarya10/puppet-neutron,larsks/puppet-neutron,CiscoSystems/puppet-neutron,rdoxenham/puppet-neutron,JioCloud/puppet-neutron,aldavud/puppet-neutron,nhinds/puppet-neutron,redhat-cip/openstack-quantum-puppet,varunarya10/puppet-neutron,DarkHorseComics/puppet-neutron,redhat-cip/puppet-neutron,aldavud/puppet-neutron,NeCTAR-RC/puppet-neutron,markvoelker/puppet-neutron,rdoxenham/puppet-neutron,fuel-infra/puppet-neutron,NeCTAR-RC/puppet-neutron,NeCTAR-RC/puppet-neutron,fuel-infra/puppet-neutron,rdo-puppet-modules/puppet-neutron,plumgrid/puppet-neutron,arnaudmorinol/puppet-neutron,cloudbuy/puppet-neutron,enovance/openstack-quantum-puppet,redhat-cip/puppet-neutron,aquto/puppet-neutron,cloudbuy/puppet-neutron,rdo-puppet-modules/puppet-neutron,IPnett/puppet-neutron,cloudbuy/puppet-neutron,markvoelker/puppet-neutron,DarkHorseComics/puppet-neutron,IPnett/puppet-neutron,larsks/puppet-neutron,trihoangvo/puppet-neutron,nhinds/puppet-neutron,hkumarmk/puppet-neutron,CiscoSystems/puppet-neutron,hkumarmk/puppet-neutron,arnaudmorinol/puppet-neutron,JioCloud/puppet-neutron,trihoangvo/puppet-neutron,redhat-cip/puppet-neutron,redhat-cip/openstack-quantum-puppet,aquto/puppet-neutron,IPnett/puppet-neutron,JioCloud/puppet-neutron,plumgrid/puppet-neutron