Add default loadbalancer neutron env file
Add default loadbalancer neutron env file

By default neutron LB is used and required option/mapping
is set in example env files. For consistency it should be also
possible to use this env file explicitly (as stated in README).

redhat-openstack/openshift-on-openstack,redhat-openstack/openshift-on-openstack,markllama/openshift-on-openstack,markllama/openshift-on-openstack